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135822-72-9

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135822-72-9 Usage

General Description

2,2'-Bipyridyl-5,5'-dialdehyde is a chemical compound with the molecular formula C12H8N2O2. It is a derivative of bipyridine and is commonly used as a building block in the synthesis of various organic compounds and coordination complexes. 2,2'-BIPYRIDYL-5,5'-DIALDEHYDE is known for its ability to form chelating complexes with metal ions, making it useful in various fields such as coordination chemistry, catalysis, and material science. It has also been studied for its potential applications in sensors, fluorescent probes, and organic light-emitting diodes. Its unique properties and reactivity make it a versatile and important compound in the field of organic and inorganic chemistry.

Check Digit Verification of cas no

The CAS Registry Mumber 135822-72-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,5,8,2 and 2 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 135822-72:
(8*1)+(7*3)+(6*5)+(5*8)+(4*2)+(3*2)+(2*7)+(1*2)=129
129 % 10 = 9
So 135822-72-9 is a valid CAS Registry Number.

135822-72-9SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 17, 2017

Revision Date: Aug 17, 2017

1.Identification

1.1 GHS Product identifier

Product name 6-(5-formylpyridin-2-yl)pyridine-3-carbaldehyde

1.2 Other means of identification

Product number -
Other names 6-(5-formyl-2-pyridyl)pyridine-3-carbaldehyde

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:135822-72-9 SDS

135822-72-9Synthetic route

2-isopropyl-1,2-dihydro-[2,2']bipyridinyl-5,5'-dicarbaldehyde

2-isopropyl-1,2-dihydro-[2,2']bipyridinyl-5,5'-dicarbaldehyde

A

2-hydroperoxypropane
3031-75-2

2-hydroperoxypropane

B

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

Conditions
ConditionsYield
With air In dichloromethane at 20℃;A n/a
B 99%
(1E,1'E)-2,2'-([2,2'-bipyridine]-5,5'-diyl)bis(N,N-dimethylethen-1-amine)

(1E,1'E)-2,2'-([2,2'-bipyridine]-5,5'-diyl)bis(N,N-dimethylethen-1-amine)

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

Conditions
ConditionsYield
With sodium periodate In tetrahydrofuran; dichloromethane; water at 20℃;73%
With sodium periodate In tetrahydrofuran; dichloromethane; water at 20℃; for 20h;72%
With sodium periodate In tetrahydrofuran; dichloromethane; water at 20℃; for 20h;70%
With sodium periodate In tetrahydrofuran; dichloromethane; water at 20℃; for 20h;70%
(2-(4′-(2-dimethylaminovinyl)-(2,2′)-bipyridinyl-4-yl)vinyl)dimethylamine

(2-(4′-(2-dimethylaminovinyl)-(2,2′)-bipyridinyl-4-yl)vinyl)dimethylamine

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

Conditions
ConditionsYield
With sodium periodate In tetrahydrofuran; dichloromethane; water at 20℃; for 20h;72%
With sodium periodate In tetrahydrofuran; dichloromethane; water at 20℃; for 22h; Inert atmosphere;60%
With sodium periodate In tetrahydrofuran; water
4,4′-bis(hydroxymethyl)-2,2′-bipyridine
63361-65-9

4,4′-bis(hydroxymethyl)-2,2′-bipyridine

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

Conditions
ConditionsYield
With Dess-Martin periodane In dichloromethane at 20℃; for 1h; Inert atmosphere;63%
With pyridine; lead(IV) acetate at 90℃; for 2h;15 % Chromat.
5,5'-bis(bromomethyl)-2,2'-bipyridine
92642-09-6

5,5'-bis(bromomethyl)-2,2'-bipyridine

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

Conditions
ConditionsYield
With sodium hydrogencarbonate; dimethyl sulfoxide at 115℃; for 3.5h;49%
With hexamethylenetetramine In ethanol; water for 60h;
5,5'-Bis(carboxyethyl)-2,2'-bipyridine
153305-75-0

5,5'-Bis(carboxyethyl)-2,2'-bipyridine

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1.1: NaBH4 / ethanol / Heating
1.2: acetone / 1 h / Heating
1.3: aq. K2CO3 / 1 h / Heating
2.1: 15 percent Chromat. / pyridine; Pb(CH3CO2)4 / 2 h / 90 °C
View Scheme
5,5'-dimethyl-2,2'-bipyridine
1762-34-1

5,5'-dimethyl-2,2'-bipyridine

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: N,N-dimethyl-formamide
2: sodium periodate / tetrahydrofuran; water
View Scheme
Multi-step reaction with 2 steps
1: N-Bromosuccinimide; dibenzoyl peroxide / tetrachloromethane / 14 h / Inert atmosphere; Reflux
2: hexamethylenetetramine / water; ethanol / 60 h
View Scheme
Multi-step reaction with 2 steps
1: N,N-dimethyl-formamide / 72 h / 120 °C / Inert atmosphere
2: sodium periodate / dichloromethane; tetrahydrofuran; water / 22 h / 20 °C / Inert atmosphere
View Scheme
2,2'-bipyridine-5,5'-dicarboxylic acid
1802-30-8

2,2'-bipyridine-5,5'-dicarboxylic acid

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

Conditions
ConditionsYield
Multi-step reaction with 3 steps
1: sulfuric acid / 16 h / Reflux; Inert atmosphere
2: sodium tetrahydroborate / ethanol / 4 h / Reflux; Inert atmosphere
3: Dess-Martin periodane / dichloromethane / 1 h / 20 °C / Inert atmosphere
View Scheme
[2,2']bipyridinyl-5,5'-dicarboxylic acid diethyl ester
1762-46-5

[2,2']bipyridinyl-5,5'-dicarboxylic acid diethyl ester

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: sodium tetrahydroborate / ethanol / 4 h / Reflux; Inert atmosphere
2: Dess-Martin periodane / dichloromethane / 1 h / 20 °C / Inert atmosphere
View Scheme
N,N'-dihydroxy-2,3-dimethylbutane-2,3-diamine
14384-45-3

N,N'-dihydroxy-2,3-dimethylbutane-2,3-diamine

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

5,5'-bis(1,3-dihydroxy-4,4,5,5-tetramethylimidazolin-2-yl)-2,2'-bipyridine

5,5'-bis(1,3-dihydroxy-4,4,5,5-tetramethylimidazolin-2-yl)-2,2'-bipyridine

Conditions
ConditionsYield
In toluene Inert atmosphere; Reflux;88%
In methanol at 20℃; for 72h; Condensation;85%
2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

(1S,2S)-cyclohexane-1,2-diammonium 2,3-dihydroxysuccinate

(1S,2S)-cyclohexane-1,2-diammonium 2,3-dihydroxysuccinate

C54H54N12

C54H54N12

Conditions
ConditionsYield
With triethylamine In methanol; chloroform at 20℃; for 24h;84%
2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

(1R,2R)-1,2-diaminocyclohexane tartrate

(1R,2R)-1,2-diaminocyclohexane tartrate

C54H54N12

C54H54N12

Conditions
ConditionsYield
With triethylamine In methanol; chloroform at 20℃; for 24h;82%
2,2',2''-triaminotriethylamine
4097-89-6

2,2',2''-triaminotriethylamine

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

N2((CH2)2NCH(C5NH3)2CHN(CH2)2)3
135852-89-0

N2((CH2)2NCH(C5NH3)2CHN(CH2)2)3

Conditions
ConditionsYield
In acetonitrile Ambient temperature;78%
4,4’,4’’,4’’’-(pyrene-1,3,6,8-tetrayl) tetra aniline
1610471-69-6

4,4’,4’’,4’’’-(pyrene-1,3,6,8-tetrayl) tetra aniline

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

C208H136N24

C208H136N24

Conditions
ConditionsYield
With acetic acid In 1,3-dioxane; water; 1,3,5-trimethyl-benzene at 120℃; for 168h;76.8%
2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

1,2-diamino-benzene
95-54-5

1,2-diamino-benzene

5,5′-bis(1H-benzo[d]imidazol-2-yl)-2,2′-bipyridine

5,5′-bis(1H-benzo[d]imidazol-2-yl)-2,2′-bipyridine

Conditions
ConditionsYield
In dimethyl sulfoxide at 120℃; for 6h;75%
n-Dodecylamine
124-22-1

n-Dodecylamine

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

4,4'-didodecyldiimino-2,2'-bipyridine

4,4'-didodecyldiimino-2,2'-bipyridine

Conditions
ConditionsYield
In ethanol for 7h; Heating;72%
2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

2-amino-phenol
95-55-6

2-amino-phenol

C24H18N4O2

C24H18N4O2

Conditions
ConditionsYield
In ethanol at 70℃; for 3h;70%
diisopropyl zinc
625-81-0

diisopropyl zinc

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

2-isopropyl-1,2-dihydro-[2,2']bipyridinyl-5,5'-dicarbaldehyde

2-isopropyl-1,2-dihydro-[2,2']bipyridinyl-5,5'-dicarbaldehyde

Conditions
ConditionsYield
In toluene at 0℃; for 1h;69%
3,5-dimethyl-4H-1,2,4-triazol-4-amine
3530-15-2

3,5-dimethyl-4H-1,2,4-triazol-4-amine

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

C20H20N10

C20H20N10

Conditions
ConditionsYield
In ethanol Solvent; Concentration; Reflux;69%
1,3,5,7-tetrakis-(4-aminophenyl)adamantane

1,3,5,7-tetrakis-(4-aminophenyl)adamantane

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

C82H60N12O4

C82H60N12O4

Conditions
ConditionsYield
With acetic acid In 1,4-dioxane; water at 140℃; for 120h; Temperature; Sonication; Sealed tube;68%
N,N'-dihydroxy-2,3-dimethylbutane-2,3-diamine
14384-45-3

N,N'-dihydroxy-2,3-dimethylbutane-2,3-diamine

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

5,5'-bis(3''-oxide-1''-oxyl-4'',4'', 5'',5''-tetramethylimidazolin-2''-yl)-2,2'-bipyridine
156137-23-4

5,5'-bis(3''-oxide-1''-oxyl-4'',4'', 5'',5''-tetramethylimidazolin-2''-yl)-2,2'-bipyridine

Conditions
ConditionsYield
With sodium periodate In dichloromethane; water at 0℃;52%
2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

5,5'-Bis(carboxyethyl)-2,2'-bipyridine
153305-75-0

5,5'-Bis(carboxyethyl)-2,2'-bipyridine

Poly(5,5'-vinylene-2,2'-bipyridine)

Poly(5,5'-vinylene-2,2'-bipyridine)

Conditions
ConditionsYield
With sodium ethanolate In ethanol; dichloromethane at 20℃;50%
isopropylmagnesium bromide
920-39-8

isopropylmagnesium bromide

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

A

5'-(1-hydroxy-2-methyl-propyl)-[2,2']bipyridinyl-5-carbaldehyde

5'-(1-hydroxy-2-methyl-propyl)-[2,2']bipyridinyl-5-carbaldehyde

B

1-[5'-(1-hydroxy-2-methyl-propyl)-[2,2']bipyridinyl-5-yl]-2-methyl-propan-1-ol

1-[5'-(1-hydroxy-2-methyl-propyl)-[2,2']bipyridinyl-5-yl]-2-methyl-propan-1-ol

Conditions
ConditionsYield
In tetrahydrofuran; diethyl ether at 0℃;A 17%
B 35%
2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

ethylene glycol
107-21-1

ethylene glycol

5,5'-di(1,3-dioxolan-2-yl)-2,2'-bipyridine
1429408-43-4

5,5'-di(1,3-dioxolan-2-yl)-2,2'-bipyridine

Conditions
ConditionsYield
With toluene-4-sulfonic acid at 110℃; Inert atmosphere;35%
3,5-dimethyl-4H-1,2,4-triazol-4-amine
3530-15-2

3,5-dimethyl-4H-1,2,4-triazol-4-amine

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

C20H24N10O2

C20H24N10O2

Conditions
ConditionsYield
In acetonitrile Reflux;31%
di-n-butylzinc
1119-90-0

di-n-butylzinc

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

A

2-butyl-1,2-dihydro-[2,2']bipyridinyl-5,5'-dicarbaldehyde

2-butyl-1,2-dihydro-[2,2']bipyridinyl-5,5'-dicarbaldehyde

B

5'-(1-hydroxy-pentyl)-[2,2']bipyridinyl-5-carbaldehyde

5'-(1-hydroxy-pentyl)-[2,2']bipyridinyl-5-carbaldehyde

C

1-[5'-(1-hydroxy-pentyl)-[2,2']bipyridinyl-5-yl]-pentan-1-ol

1-[5'-(1-hydroxy-pentyl)-[2,2']bipyridinyl-5-yl]-pentan-1-ol

Conditions
ConditionsYield
In toluene at 0℃;A 17%
B 26%
C 15%
diethylzinc
557-20-0

diethylzinc

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

A

2-ethyl-1,2-dihydro-[2,2']bipyridinyl-5,5'-dicarbaldehyde

2-ethyl-1,2-dihydro-[2,2']bipyridinyl-5,5'-dicarbaldehyde

B

5'-(1-hydroxy-propyl)-[2,2']bipyridinyl-5-carbaldehyde

5'-(1-hydroxy-propyl)-[2,2']bipyridinyl-5-carbaldehyde

C

1-[5'-(1-hydroxy-propyl)-[2,2']bipyridinyl-5-yl]-propan-1-ol

1-[5'-(1-hydroxy-propyl)-[2,2']bipyridinyl-5-yl]-propan-1-ol

Conditions
ConditionsYield
In toluene at 0℃;A 19%
B 18%
C 24%
isopropyllithium
1888-75-1

isopropyllithium

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

A

5'-(1-hydroxy-2-methyl-propyl)-[2,2']bipyridinyl-5-carbaldehyde

5'-(1-hydroxy-2-methyl-propyl)-[2,2']bipyridinyl-5-carbaldehyde

B

1-[5'-(1-hydroxy-2-methyl-propyl)-[2,2']bipyridinyl-5-yl]-2-methyl-propan-1-ol

1-[5'-(1-hydroxy-2-methyl-propyl)-[2,2']bipyridinyl-5-yl]-2-methyl-propan-1-ol

Conditions
ConditionsYield
In toluene; pentane at 0℃;A 3%
B 9%
N,N'-dihydroxy-2,3-dimethylbutane-2,3-diamine
14384-45-3

N,N'-dihydroxy-2,3-dimethylbutane-2,3-diamine

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

C24H32N6O2

C24H32N6O2

Conditions
ConditionsYield
With selenium(IV) oxide In methanol Ambient temperature;
tetrakis-5,10,15,20-(o-aminophenyl)porphyrin
52199-35-6

tetrakis-5,10,15,20-(o-aminophenyl)porphyrin

2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

C136H84N24

C136H84N24

Conditions
ConditionsYield
With trifluoroacetic acid In N,N-dimethyl acetamide; acetonitrile for 12h; Ambient temperature;
2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

5,5'-bis(3''-oxide-1''-oxyl-4'',4'', 5'',5''-tetramethylimidazolin-2''-yl)-2,2'-bipyridine
156137-23-4

5,5'-bis(3''-oxide-1''-oxyl-4'',4'', 5'',5''-tetramethylimidazolin-2''-yl)-2,2'-bipyridine

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: 85 percent / methanol / 72 h / 20 °C
2: 52 percent / aq. sodium periodate / CH2Cl2 / 1 h
View Scheme
2,2′-bipyridine-5,5′-dicarbaldehyde
135822-72-9

2,2′-bipyridine-5,5′-dicarbaldehyde

2,2'-(bipyridine-1,1'-diyl)bis(4,4,5,5-tetramethylimidazolidine-1-oxyl)

2,2'-(bipyridine-1,1'-diyl)bis(4,4,5,5-tetramethylimidazolidine-1-oxyl)

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1: SeO2 / methanol / Ambient temperature
2: 65 percent / NaIO4
View Scheme
Multi-step reaction with 2 steps
1: toluene / Inert atmosphere; Reflux
2: manganese(IV) oxide / nitromethane / 0.58 h / 20 °C
View Scheme

135822-72-9Downstream Products

135822-72-9Relevant articles and documents

Colorimetric detection of in situ metal acetates and fluorides by a bipyridyl-linked Schiff base

Suganya, Sivalingam,Zo, Hye Jin,Park, Jong S.,Velmathi, Sivan

, p. 689 - 695 (2014)

A new bipyridyl moiety linked Schiff base (bipy-1) was developed and showed selective recognition of dimethyl sulphoxide solution of tetrabutyl ammonium salt of F- ion with absorbance at 529 nm and interesting binding of aqueous Co, Ni, and Cu acetates/fluorides, as confirmed by distinct color changes from fluorescent green to pink or orange with absorbance at 480-510 nm. However, in situ formation of Co, Ni, and Cu acetates/fluorides also was found to be able to respond to similar color and absorption changes.

Unusual chemoselective addition of diisopropylzinc to 2,2′-bipyridine-5,5′-dicarbonyl compounds in the 2-position and autoxidative reconversion with carbon-carbon bond cleavage

Tanji, Shigehisa,Shibata, Takanori,Sato, Itaru,Soai, Kenso

, p. 217 - 218 (2001)

The chemoselective addition of diisopropylzinc to 2,2′-bipyridine-5,5′-dicarbonyl compounds in the 2-position and autoxidative reconversion with carbon-carbon bond cleavage was presented. It was shown that i-Pr2Zn do not add to the aldehyde moiety but to the 2-position of the bipyridine to afford possessing a quaternary carbon atom in a yield of 69%. It was found that the i-Pr2Zn does not add to the aldehyde but to the 2-position of the bipyridine ring by destroying the aromaticity of the pyridine ring.

Photocurrent response of bipyridine containing poly(p-phenylene-vinylene) derivatives

Narayan,Geetha,Nakmanovich,Ehrenfreund,Eichen

, p. 7671 - 7677 (2001)

The photoinduced charge separation and subsequent transport under an external electric field is studied in the family of poly[bipyridine/(p-phenylene-vinylene)n] derivatives having n = 0, 1, and 3, respectively, p-phenylene-vinylene subunits separating the bipyridylene vinylene skeleton. Steady-state photocurrent of the polymers is studied in sandwich and surface configurations and correlated with transient photocurrent measurements. The results reveal the facile electric-field-induced separation of the electron-hole pair for n = 1 samples relative to n = 3 samples. We also estimate the energy barriers involved in the process of carrier generation and transport in these systems.

Designed synthesis of porphyrin-based two-dimensional covalent organic frameworks with highly ordered structures

Chen, Xiong,Gao, Jia,Jiang, Donglin

, p. 1257 - 1259 (2015)

Porphyrins are representative functional π-systems; synthesizing their highly ordered structures is an established goal in chemistry. Here, we report the designed synthesis of a series of porphyrin-based covalent organic frameworks with highly ordered structures through polycondensation. The porphyrinbased frameworks exhibited high crystallinity, high porosity, and extended π-conjugation over the polyporphyrin sheets.

Phosphonate-Mediated Immobilization of Rhodium/Bipyridine Hydrogenation Catalysts

Forato, Florian,Belhboub, Anouar,Monot, Julien,Petit, Marc,Benoit, Roland,Sarou-Kanian, Vincent,Fayon, Franck,Jacquemin, Denis,Queffelec, Clémence,Bujoli, Bruno

, p. 2457 - 2465 (2018/02/06)

RhL2 complexes of phosphonate-derivatized 2,2′-bipyridine (bpy) ligands L were immobilized on titanium oxide particles generated in situ. Depending on the structure of the bipy ligand—number of tethers (1 or 2) to which the phosphonate end groups are attached and their location on the 2,2′-bipyridine backbone (4,4′-, 5,5′-, or 6,6′-positions)—the resulting supported catalysts showed comparable chemoselectivity but different kinetics for the hydrogenation of 6-methyl-5-hepten-2-one under hydrogen pressure. Characterization of the six supported catalysts suggested that the intrinsic geometry of each of the phosphonate-derivatized 2,2′-bipyridines leads to supported catalysts with different microstructures and different arrangements of the RhL2 species at the surface of the solid, which thereby affect their reactivity.

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