1104-93-4

Basic information

• Product Name: 1,1,3,3-TETRAPHENYLDISILOXANE DIOL
• Synonyms: 1,1,3,3-TETRAPHENYLDISILOXANE DIOL;1,3-Dihydroxy-1,1,3,3-tetraphenyldisiloxane;1,1,3,3-Tetraphenyl-1,3-disiloxanediol;hydroxy-[hydroxy(diphenyl)silyl]oxy-diphenylsilane
• CAS NO: 1104-93-4
• Molecular Formula: C₂₄H₂₂O₃Si₂
• Molecular Weight: 414.6
• EINECS: 213-990-6
• Mol File: 1104-93-4.mol
• Article Data: 8

Chemical Properties

• Melting Point: 113-114 °C
• Boiling Point: 522.2 °C at 760 mmHg
• Flash Point: 269.6 °C
• Appearance: /
• Density: 1.21 g/cm³
• Vapor Pressure: 9.9E-12mmHg at 25°C
• Refractive Index: 1.641
• PKA: 10.83±0.53(Predicted)
• CAS DataBase Reference: 1,1,3,3-TETRAPHENYLDISILOXANE DIOL(CAS DataBase Reference)
• NIST Chemistry Reference: 1,1,3,3-TETRAPHENYLDISILOXANE DIOL(1104-93-4)
• EPA Substance Registry System: 1,1,3,3-TETRAPHENYLDISILOXANE DIOL(1104-93-4)

Safety Data

• Hazardous Substances Data: 1104-93-4(Hazardous Substances Data)

Usage

InChI:InChI=1/C24H22O3Si2/c25-28(21-13-5-1-6-14-21,22-15-7-2-8-16-22)27-29(26,23-17-9-3-10-18-23)24-19-11-4-12-20-24/h1-20,25-26H

Synthetic route

1,3-dichloro-1,1,3,3-tetraphenyldisiloxane (7756-87-8) → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4)

Conditions	Yield
In tert-Amyl alcohol; toluene hydrolysis at room temp.;;	92%
In tert-Amyl alcohol; toluene hydrolysis at room temp.;;	92%
With water; triethylamine In diethyl ether; acetone at 0 - 20℃;	81%

hydrogenchloride (7647-01-0) + C30H38O3P2PtSi2 → cis-dichlorobis(trimethylphosphine)platinum(II) (19471-47-7, 15630-86-1, 21545-76-6) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4)

Conditions	Yield
In 1,4-dioxane; dichloromethane at 20℃;	A 89% B 64%

diphenylsilane (775-12-2) → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4)

Conditions	Yield
With water at 80℃; Temperature;	75%

diphenylsilanediol (947-42-2) → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4)

Conditions	Yield
at 125 - 128℃;
With ammonium hydroxide; acetone
With hydrogenchloride
In not given recrystn. of (C6H5)2Si(OH)2 in presence of acid;;

diphenylsilanediol (947-42-2) → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + Hexaphenyltrisiloxan-1,5-diol (1110-85-6)

Conditions	Yield
at 125 - 128℃;

1,3-diethoxy-1,1,3,3-tetraphenyl-disiloxane (18848-24-3) → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4)

Conditions	Yield
With hydrogenchloride

diphenylsilyl dichloride (80-10-4) → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4)

Conditions	Yield
With ammonium hydroxide
Multi-step reaction with 2 steps 1: diluted KOH-solution 2: hydrochloric acid View Scheme
Multi-step reaction with 2 steps 1: diethyl ether; aqueous dioxane 2: tert-pentyl alcohol; toluene; water View Scheme

diphenylsilyl dichloride (80-10-4) → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + diphenylsilanediol (947-42-2) + Hexaphenyltrisiloxan-1,5-diol (1110-85-6)

Conditions	Yield
With ammonium carbonate In diethyl ether for 12h; Heating;	A 8.3 g B 8.0 g C n/a

diphenylsilanediol (947-42-2) + ammonium hydroxide + acetone (67-64-1) → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + Hexaphenyltrisiloxan-1,5-diol (1110-85-6)

phenylmagnesium bromide → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4)

Conditions	Yield
Multi-step reaction with 2 steps 1: diethyl ether; silicon tetrachloride 2: concentrated aqueous ammonia View Scheme
Multi-step reaction with 3 steps 1: diethyl ether; silicon tetrachloride 2: diluted KOH-solution 3: hydrochloric acid View Scheme
Multi-step reaction with 2 steps 1: diethyl ether; silicon tetrachloride 2: hydrochloric acid View Scheme

diphenylsilyl dichloride (80-10-4) → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + diphenylsilanediol (947-42-2)

Conditions	Yield
With H2O; NH3 In ammonia aq. ammonia=NH3;
With H2O In water

diphenylsilanediol (947-42-2) + diphenylsilyl dichloride (80-10-4) → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + Hexaphenyltrisiloxan-1,5-diol (1110-85-6)

Conditions	Yield
mech. sepn. of the crystals;;

Hexaphenyltrisiloxan-1,5-diol (1110-85-6) → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4)

Conditions	Yield
Multi-step reaction with 2 steps 1: KOH / ethanol 2: not given View Scheme
Multi-step reaction with 2 steps 1: KOH / ethanol View Scheme

1,1,3,3,5,5-hexaphenylcyclotrisiloxane (512-63-0) → 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4)

Conditions	Yield
Multi-step reaction with 3 steps 1: HCl / acetone; chloroform 2: KOH / ethanol View Scheme

diethyl ether (60-29-7) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → 2C24H20O3Si2(2-)*4Li(1+)*4C4H10O

Conditions	Yield
With n-butyllithium In hexane at 0 - 20℃; for 24h; Inert atmosphere; Schlenk technique; Glovebox;	100%

tetrahydrofuran (109-99-9) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → 2C24H20O3Si2(2-)*4Li(1+)*4C4H8O

Conditions	Yield
With n-butyllithium In hexane at 0 - 20℃; for 12h; Inert atmosphere; Schlenk technique; Glovebox;	100%

phenyldimethoxystibine (99716-11-7) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → 1,3,5,7,9,11-hexaoxa-2,4,4',6,6',8,10,10',12,12'-decaphenyl-4,6,10,12-tetrasila-2,8-distibacylododecane

Conditions	Yield
In dichloromethane byproducts: MeOH; Ar; Si-compd. soln. addn. slowly dropwise to Sb-compd. soln. at 0°C, stirring for 30 min at same temp., solvent vac. removal; elem. anal.;	98%

diisopropoxidobis(2,4-pentanedionato)zirconium(IV) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → 2,2,4,4,8,8,10,10-octaphenyl-6,6,12,12-tetrakis(2,4-pentanedionato-κ(2)O)-2,4,8,10-tetrasila-6,12-dizircona-1,3,5,7,9,11-hexaoxacyclododecane

Conditions	Yield
In tetrahydrofuran byproducts: isopropyl alcohol; soln. of Zr complex in THF added to soln. of Si compound in THF; heated at 50°C for 1h; solvents removed under vac.; the residue dissolved in THF, poured into hexane with vigorous stirring; filtered; elem. anal.;	96.1%

1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + dimethoxymethylstibane (54553-25-2) → 2,8-dimethyl-1,3,5,7,9,11-hexaoxa-4,4',6,6',10,10',12,12'-octaphenyl-4,6,10,12-tetrasila-2,8-distibacylododecane (169828-90-4)

Conditions	Yield
In dichloromethane byproducts: MeOH; Ar; Si-compd. soln. addn. slowly dropwise to Sb-compd. soln. at 0°C, stirring for 30 min at same temp., solvent vac. removal; elem. anal.;	96%

1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + phenylboronic acid (98-80-6) → pentaphenylboracyclotrisiloxane (136745-52-3)

Conditions	Yield
In benzene byproducts: water; refluxing (equimolar mixture, 4 h, continuous removal of water); cooling, filtration, distn. (reduced pressure), recrystn. (Et2O:petroleum ether 1:3); elem. anal.;	95%

[Cp(CO)2W]2SnCl2 (37336-24-6) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → cyclo-1,1-bis((η(5)-cyclopentadienyl)tricarbonyltungsten)-3,3,5,5-tetraphenyl-2,4,6-trioxa-3,5-disila-1-stannacyclohexane

Conditions	Yield
With NEt3 In diethyl ether byproducts: [HNEt3]Cl; N2-atmosphere; stirring (room temp., overnight); filtering, evapn. (reduced pressure); elem. anal.;	95%

1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + dihydrogen peroxide (7722-84-1) + tetraphenyl phosphonium chloride (2001-45-8) + molybdenum(VI) oxide → 2P(C6H5)4(1+)*(MoO(O2)2)2(O3Si2(C6H5)4)(2-) = [P(C6H5)4]2[(MoO(O2)2)2(O3Si2(C6H5)4)]

Conditions	Yield
With NaOH In ethanol; water addn. of MoO3 to aq. H2O2, stirring (60°C, 1 h), cooling to room temp., centrifugation, addn. to the siloxane in EtOH, addn. of aq. NaOH,stirring (45 min), pptn. with (PPh4)Cl in EtOH; filtration, washing (H2O; Et2O), drying in air;	95%

1-tert-butyl-1-((η(5)-cyclopentadienyl)tricarbonyltungsten)tin dichloride + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → cyclo-1-tert-butyl-1-((η(5)-cyclopentadienyl)tricarbonyltungsten)-3,3,5,5-tetraphenyl-2,4,6-trioxa-3,5-disila-1-stannacyclohexane

Conditions	Yield
With NEt3 In diethyl ether byproducts: [HNEt3]Cl; N2-atmosphere; stirring (room temp., overnight), filtering, evapn. (reduced pressure); elem. anal.;	91%

bis(η5-cyclopentadienyldicarbonyliron)stannane dichloride + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → cyclo-1,1-bis((η(5)-cyclopentadienyl)dicarbonyliron)-3,3,5,5-tetraphenyl-2,4,6-trioxa-3,5-disila-1-stannacyclohexane

Conditions	Yield
With NEt3 In diethyl ether byproducts: [HNEt3]Cl; N2-atmosphere; stirring (room temp., overnight); filtering, evapn. (reduced pressure); elem. anal.;	91%

1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + bis(triphenyltin) oxide (1262-21-1) → 1,3-bis-(triphenylstannoxy)-1,1,3,3-tetraphenyl-1,3-disiloxane (156116-74-4)

Conditions	Yield
In benzene byproducts: H2O; refluxing; removing solvent (vac.), recrystn. (60-80 petrol), elem. anal.;	90%

2,3-dimethyl-2,3-butane diol (76-09-5) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + boric acid (11113-50-1) → O(Si(C6H5)2OB(OC(CH3)2)2)2 (255849-45-7)

Conditions	Yield
In not given byproducts: H2O; inert atmosphere; elem. anal.;	88.8%

(chloromethyl)trichlorosilane (1558-25-4) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → 2-Chloro-2-chloromethyl-4,4,6,6-tetraphenyl-[1,3,5,2,4,6]trioxatrisilinane (79891-82-0) + C26H24Cl6O3Si4

Conditions	Yield
With pyridine In toluene for 3h; Heating;	A n/a B 87.6%

Methyltrichlorosilane (75-79-6) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → 1,1,7,7-tetrachloro-1,7-dimethyl-3,3,5,5-tetraphenyltetrasiloxane (100278-00-0)

Conditions	Yield
In diethyl ether at -5℃; for 2h;	87.5%

2-methyl-2,4-pentanediol (107-41-5) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + boric acid (11113-50-1) → O(Si(C6H5)2OBO2C3H3(CH3)3)2 (255849-46-8)

Conditions	Yield
In not given byproducts: H2O; inert atmosphere; elem. anal.;	87.1%

iron(II) triflate + 1,2-dimethoxyethane (110-71-4) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + lithium tert-butoxide (1907-33-1) → C56H60FeLi2O10Si4

Conditions	Yield
Stage #1: 1,1,3,3-tetraphenyldisiloxane-1,3-diol; lithium tert-butoxide In tetrahydrofuran at 20℃; for 3.5h; Inert atmosphere; Stage #2: iron(II) triflate In tetrahydrofuran at 20℃; Inert atmosphere; Stage #3: 1,2-dimethoxyethane In hexane at 20℃; Inert atmosphere;	87%

trichlorovinylsilane (75-94-5) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → 2-Chloro-4,4,6,6-tetraphenyl-2-vinyl-[1,3,5,2,4,6]trioxatrisilinane (56269-45-5) + 1,1,7,7-tetrachloro-1,7-divinyltetraphenyltetrasiloxane

Conditions	Yield
With pyridine In toluene for 3h; Heating;	A n/a B 86.4%

1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + mesitylboronic acid (5980-97-2) → cyclo-1-mesityl-3,3,7,7-tetraphenyl-1-bora-3,5-disiloxane (144648-00-0)

Conditions	Yield
In benzene byproducts: water; refluxing (equimolar mixture, 4 h, continuous removal of water); cooling, filtration, distn. (reduced pressure), recrystn. (petroleum ether); elem. anal.;	86%

bis(acetylacetonato)titanium(IV) diisopropoxide + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → 2,2,4,4,8,8,10,10-octaphenyl-6,6,12,12-tetrakis(2,4-pentanedionato-κ(2)O)-2,4,8,10-tetrasila-6,12-dititana-1,3,5,7,9,11-hexaoxacyclododecane

Conditions	Yield
In tetrahydrofuran byproducts: isopropyl alcohol; soln. of Ti complex in THF added to soln. of Si compound in THF; heated at 50°C for 1h; solvents removed under vac.; the residue dissolved in THF, poured into hexane with vigorous stirring; filtered; elem. anal.;	85.2%

chromium(VI) oxide + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → (CrO2((OSi(C6H5)2)2O))2

Conditions	Yield
With 4 A molecular sieves In tetrachloromethane stirring with molecular sieves overnight; decantation of suspn. from sieves, solvent removal (vac.), trituration with hexane; elem. anal.;	85%

(((2,6-Me2NCH2)2C6H3)SbO)2 (1145663-94-0, 1146220-12-3) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → cyclo-((C6H3-2,6-(CH2NMe2)2))Sb(OSiPh2)2O

Conditions	Yield
In benzene at 20℃; Inert atmosphere; Schlenk technique;	85%

decacarbonyl-1κ(4)C,2κ(3)C,3κ(3)C-μ-hydrido-2:3κ(2)H-μ-hydroxy-2:3κ(2)O-trisosmium-(3 Os-Os) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → [Os3(CO)10(μ-H)(μ-OSiPh2OSiPh2OH)] (262446-47-9)

Conditions	Yield
In xylene Si-compd.:Os-compd.=2:1, Os-compd. concn. is 1.2E-1 M, under N2, P2O5 asH2O remover, 4 h or 9:1 molar ratio, 1E-1 M Os-compd. concn., and 11 h, resp.; yield were quant. or 50 % from NMR, resp., the first reaction mixt. was evapd. to dryness, residue was chromd. (silica, CH2Cl2/pentane=10:3), elem. anal.;	84%

1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + di-tert-butyltin dichloride (19429-30-2) → [(t-Bu2SnO)(Ph2SiO)2]n

Conditions	Yield
With NEt3 In acetone byproducts: HNEt3Cl; N2-atmosphere; dropwise addn. of Sn-compd. to equimolar amt. of Si-compd. with 2 equiv. NEt3; filtration off of HNEt3Cl, evapn. (vac.), recrystn. (PhMe); elem. anal.;	84%

tetrahydrofuran (109-99-9) + n-butyllithium (109-72-8, 29786-93-4) + terbium(III) chloride + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → [{1,1,3,3-tetraphenyldisiloxanediolate}2{Li(tetrahydrofuran)2}2]TbCl

Conditions	Yield
Stage #1: tetrahydrofuran; n-butyllithium; 1,1,3,3-tetraphenyldisiloxane-1,3-diol In hexane at 0℃; for 5h; Inert atmosphere; Schlenk technique; Glovebox; Stage #2: terbium(III) chloride In hexane Inert atmosphere; Schlenk technique; Glovebox;	84%

tetrahydrofuran (109-99-9) + chromium(III) chloride tetrahydrofuran complex (1:3) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + lithium tert-butoxide (1907-33-1) → C64H72ClCrLi2O10Si4

Conditions	Yield
Stage #1: tetrahydrofuran; 1,1,3,3-tetraphenyldisiloxane-1,3-diol; lithium tert-butoxide at 20℃; for 3h; Stage #2: chromium(III) chloride tris(tetrahydrofuran) solvate	84%

Dichloromethylvinylsilane (124-70-9) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → 2-Methyl-4,4,6,6-tetraphenyl-2-vinyl-[1,3,5,2,4,6]trioxatrisilinane (1457-02-9) + 1,7-dichloro-1,7-dimethyl-1,7-divinyl-3,3,5,5-tetraphenyltetrasiloxane (109305-36-4)

Conditions	Yield
With pyridine In toluene for 3h; Heating;	A n/a B 83.5%

bis(hydroxydiphenylstannyl)methane (95151-58-9) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) → 1,1,3,3,5,5,7,7-octaphenyl-4,6,8-trioxa-1,3-distanna-5,7-disilacyclooctane

Conditions	Yield
In toluene heating mixt. of hydroxystannane and hydroxysilane in toluene at 60 °C for 30 min; filtration, solvent evapn. in vac., recrystn. (hexane-CH2Cl2 1:1); elem. anal.;	81%

1,2-dimethoxyethane (110-71-4) + [scandium(III)(chloride)3(tetrahydrofuran)3] (53317-83-2, 14782-78-6) + 1,1,3,3-tetraphenyldisiloxane-1,3-diol (1104-93-4) + lithium hexamethyldisilazane (4039-32-1) → [(1,1,3,3-tetraphenyl-1,3-disiloxanediolato)2(Li(1,2-dimethoxyethane))2]ScCl(THF)0.3(1,2-dimethoxyethane)0.60

Conditions	Yield
In 1,2-dimethoxyethane byproducts: LiCl; under N2; LiN(SiMe3)2 added to suspn. of ScCl3(THF)3 in DME; stirred for12 h; treated with solid disiloxanediol; heated under reflux for 1 h; filtered; filtrate concd.; crystd. at 2°C for 1 wk; elem. anal.;	81%

Upstream product

• 775-12-2 diphenylsilane 
• 7647-01-0 hydrogenchloride 
• 512-63-0 1,1,3,3,5,5-hexaphenylcyclotrisiloxane 
• 1110-85-6 Hexaphenyltrisiloxan-1,5-diol 
• 947-42-2 diphenylsilanediol 
• 80-10-4 diphenylsilyl dichloride 
• 67-64-1 acetone 
• 18848-24-3 1,3-diethoxy-1,1,3,3-tetraphenyl-disiloxane 
• 7756-87-8 1,3-dichloro-1,1,3,3-tetraphenyldisiloxane 

Downstream Products

• 1457-02-9 2-Methyl-4,4,6,6-tetraphenyl-2-vinyl-[1,3,5,2,4,6]trioxatrisilinane 
• 109305-36-4 1,7-dichloro-1,7-dimethyl-1,7-divinyl-3,3,5,5-tetraphenyltetrasiloxane 
• 79902-86-6 2,8-Dimethyl-4,4,6,6,10,10,12,12-octaphenyl-2,8-divinyl-1,3,5,7,9,11-hexaoxa-2,4,6,8,10,12-hexasila-cyclododecane 
• 31835-76-4 2-Chloromethyl-2-methyl-4,4,6,6-tetraphenyl-[1,3,5,2,4,6]trioxatrisilinane 
• 79891-87-5 2,8-Bis-chloromethyl-2,8-dimethyl-4,4,6,6,10,10,12,12-octaphenyl-1,3,5,7,9,11-hexaoxa-2,4,6,8,10,12-hexasila-cyclododecane 
• 109332-92-5 C₂₈H₃₀Cl₄O₃Si₄ 
• 512-63-0 1,1,3,3,5,5-hexaphenylcyclotrisiloxane 
• 18758-92-4 1,1,7,7,7-hexamethyl-3,3,5,5-tetraphenyltetrasiloxane 
• 546-56-5 octaphenylcyclotetrasiloxane 
• 1110-85-6 Hexaphenyltrisiloxan-1,5-diol 
• 58110-15-9 2-Methyl-4,4,6,6-tetraphenyl-2-(2-trimethylsilyl-aethyl)-cyclotrisiloxan 
• 78097-72-0 2,4,4,6,8,8,10,10-Octaphenyl-[1,3,5,7,9,2,4,6,8,10]pentoxapentasilecane-2,6-diol 
• 78097-70-8 hexaphenyl-2,2,6,6-cyclopentasiloxanetetrol 
• 78097-71-9 2,6-Dimethyl-4,4,8,8,10,10-hexaphenyl-[1,3,5,7,9,2,4,6,8,10]pentoxapentasilecane-2,6-diol 

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Novel pentacyclic ladder oligomethylsilsesquioxane was synthesized using cis,trans,cis-[MeSi(NCO)O]4 as a building block. This compound was isolated in 13% yield by reprecipitation from the reaction mixture. X-ray crystallography revealed that pentacyclic rings assume a syn,anti,syn- configuration, resulting in the tube-like structure.

A catalytic study of water dispersed gold nanoparticles for the hydrolytic oxidation of diorganosilanes-: En route formation of a Pickering catalyst and synthesis of tetraorganodisiloxane-1,3-diols

Water-dispersed gold nanoparticles decorated with an amphiphilic cyclotetrasiloxane scaffold hold promise for the catalytic transformation of diorganosilanes to tetraorganodisiloxane-1,3-diols, (RR1SiOH)2O [R = Me or Ph R1 = Ph, cyclo-Hex] via en route formation of a Pickering emulsion. The recognition ability of these compounds toward Cl- ions reveals 2?:?1 receptor-anion complexation.

Stereochemistry of the reaction of cis,trans,cis-2,4,6,8-tetraisocyanato-2, 4,6,8-tetramethylcyclotetrasiloxane with triphenylsilanol and 1,1,3,3-tetraphenyldisiloxane-1,3-diol

All-cis-2,4,6,8-tetramethyl-2,4,6,8-tetrakis(triphenylsiloxy) cyclotetrasiloxane (4) and syn-1,3,9,11-tetramethyl-5,5,7,7,13,13,15,15- octaphenyltricyclo[9.5.1.13,9]octasiloxane (5) were synthesized by the reaction of cis,trans,cis-[MeSi(NCO)O]4 (1) with Ph 3SiOH (2) and [Ph2Si(OH)]2O (3), respectively, in the presence of pyridine for the sake of investigating the synthesis of ladder polysilsesquioxanes with perfect siloxane frameworks. Their stereostructures were confirmed by nuclear magnetic resonance spectra and X-ray crystallography, which revealed that 4 and 5 did not retain the stereostructure of the precursor 1. This result was caused by the racemization of 1 with pyridine, and a subsequent nucleophilic substitution reaction of 1 with 2 or 3, including inversion and retention of the configuration at the silicon atoms.