The oxidation of primary alcohols to methyl esters and diols to lactones using trichloroisocyanuric acid

Article abstract of DOI:10.1081/SCC-120021026

Primary alcohols and diols are easily oxidized to methyl esters by a solution of trichloroisocyanuric acid with methyl alcohol in dichloromethane. In addition, α,ω-diols are also readily oxidized into lactones by refluxing with trichloroisocyanuric acid and pyridine in dichloromethane.

Full text of DOI:10.1081/SCC-120021026

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The Oxidation of Primary Alcohols to Methyl Esters and
Diols to Lactones Using Trichloroisocyanuric Acid
Prof. Gene A. Hiegel a & Cynthia B. Gilley a
a Department of Chemistry and Biochemistry, California State University, Fullerton,
California, USA
Published online: 17 Aug 2006.
To cite this article: Prof. Gene A. Hiegel & Cynthia B. Gilley (2003): The Oxidation of Primary Alcohols to Methyl Esters
and Diols to Lactones Using Trichloroisocyanuric Acid, Synthetic Communications: An International Journal for Rapid
Communication of Synthetic Organic Chemistry, 33:12, 2003-2009
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SYNTHETIC COMMUNICATIONSÕ
Vol. 33, No. 12, pp. 2003–2009, 2003
The Oxidation of Primary Alcohols to Methyl
Esters and Diols to Lactones Using
Trichloroisocyanuric Acid
*
Gene A. Hiegel and Cynthia B. Gilley
Department of Chemistry and Biochemistry, California
State University, Fullerton, California, USA
ABSTRACT
Primary alcohols and diols are easily oxidized to methyl esters by
a solutionof trichloroisocyaunric acid with methyl alcohol in
dichloromethane. In addition, a,o-diols are also readily oxidized
into lactones by refluxing with trichloroisocyanuric acid and pyridine
indichloromethane.
Key Words: Primary alcohols; Methyl esters; Lactones; Diols;
Oxidation; Synthesis; Preparation; Trichloroisocyanuric acid.
*Correspondence: Prof. Gene A. Hiegel, Department of Chemistry and
Biochemistry, California State University, 800 N. State College Blvd.,
Fullerton, California 92834, USA; Fax: 714-278-5316; E-mail: ghiegel@
fullerton.edu.
2003
DOI: 10.1081/SCC-120021026
Copyright & 2003 by Marcel Dekker, Inc.
0039-7911 (Print); 1532-2432 (Online)
www.dekker.com

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2004
Hiegel and Gilley
Although a variety of oxidizing agents have been shown to success-
fully convert diols to lactones,[1–8] there are few methods for the synthesis
of methyl esters from primary alcohols. N-Iodosuccinimide,[7] calcium
hypochlorite,[9] and tert-butyl hypochlorite[10] have beenshownto oxidize
primary alcohols to methyl esters. We wish to report simple procedures
for the synthesis of methyl esters from primary alcohols and for lactones
from diols using trichloroisocyanuric acid (1) [1,3,5-trichloro-1,3,5-
triazine-2,4,6-(1H,3H,5H)-trione] as the oxidizing agent.[11]
Primary alcohols and diols are easily converted into the correspond-
ing methyl esters ina solutionof
1 and methyl alcohol in dichloro-
methane (Eq. (1)). The yield and purity of the isolated methyl esters
are showninTable 1.
3ROH þ 2C3N3O3Cl3 þ 3CH3OH À!
3RCO2CH3 þ 2C3H3N3O3 þ 3HCl
ð1Þ
A reasonable pathway for the transformation is shown in the Sch. 1.
Previous studies have shownthat the aldehyde to methyl ester conver-
sion[12] is significantly faster than the conversion of primary alcohols to
aldehydes.[13]
The primary alcohol to methyl ester conversion is an exothermic
reaction, but an increase in reaction temperature results in the formation
of byproducts. In addition, there is a variable induction period between
the time the reagents are mixed and when the temperature spikes.
Characteristically cyanuric acid begins to precipitate as the temperature
begins to rise. The oxidation of primary alcohols to methyl esters using 1
was carried out successfully with methyl alcohol indichloromethane,
with methyl alcohol in acetonitrile, and in methyl alcohol. The solvent
of choice for moderate or large-scale reactions is dichloromethane
because the temperature is controlled internally by the low boiling
point. If the temperature is kept at or below 40ꢀC, methanol or aceto-
nitrile can be used as solvents. Since external heat control can be proble-
matic, the recommendation is to use dichloromethane as the solvent
and to place the reactionflask ina cold water bath to facilitate heat
dissipation. Since chlorine is also present in the reaction mixture, the
reactionwas protected from light to prevent radical chainchlorination
reactions.
A complex mixture of products was formed during the oxidation of
phenethyl alcohol and 3-phenyl-1-propanol. Once phenethyl alcohol is
oxidized to phenylacetaldehyde, it is expected to have a higher enol con-
tent than most aldehydes, and therefore, more likely to form the a-chloro

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Oxidation Using Trichloroisocyanuric Acid
Table 1. The oxidationof alcohols to methyl esters.
2005
Yield
(%)
GC purity
(%)
Alcohol
Methyl ester
81a
98.9
81a
99.9
85a
75a
99.7
99.9
79a
39b
99.6
87.5
67b
96b
97.6
98.5
86b
99.8
aDistilled through a concentric tube column.
bPurified by flash chromatography.
Scheme 1.

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2006
Hiegel and Gilley
Table 2. The oxidationof alcohols to lactones.
Yielda GC purity
Alcohol
Lactone
(%)
(%)
76
98.4
72
97
97.4
99.9
aPurified by flash chromatography.
derivative. Other byproducts may also result from chlorination on the
aromatic ring.[11]
The C4 and C5 a,o-diols can be converted into their corresponding
lactones by refluxing with 1 and pyridine in dichloromethane. The yield
and purity of the isolated lactones are shown in Table 2. Pyridine is added
to absorb the hydrogen chloride formed during the oxidation.
Experiments performed without pyridine gave low yields of lactone
possibly due to polymer formation. The lactone formation reaction is
believed to proceed through a cyclic hemiacetal, which would thenbe
oxidized to the lactone. In contrast, the oxidation of 1,6-hexanediol gave
only a trace amount of e-caprolactone. However, 1,4-butanediol, 1,5-
pentanediol, 1,6-hexanediol and 1,12-dodecanediol did oxidize to the
corresponding diesters when methyl alcohol was present. The dimethyl
succinate from the oxidation of 1,4-butanediol contained an unidentified
impurity of 11.3% which may be 2-methoxytetrahydrofuranbased onan
1H-NMR peak at 3.23 ꢀ.
EXPERIMENTAL
Analysis by gas chromatography was performed using a Hewlett-
Packard 5890 Series II instrument with a 6 ft ꢁ 1/8 in10% Carbowax
20 M column. FT-IR spectra were recorded using a Perkin Elmer 1650.
1H-NMR spectra were recorded onanAnasazi-modified VarianEFT

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Oxidation Using Trichloroisocyanuric Acid
2007
90 MHz nuclear magnetic resonance spectrometer in CDCl3 or CCl4.
Flash chromatography was carried out with Merck 60 A silica gel
(230–400 mesh).
All reagents were used as received unless otherwise stated. TCICA
was obtained from OMNI with a purity of 99% (88% available chlorine).
1,4-Butanediol and 1,6-butanediol were obtained from J.T. Baker.
Phenethyl alcohol was reagent grade from Eastman. All other chemicals
were obtained from Aldrich. 1-Nonanol was obtained from Aldrich and
distilled prior to use. All products were purified by distillationor flash
chromatography and were characterized by comparison with authentic
1
samples using IR and H-NMR spectra and GC retention time.
Oxidation of Benzyl Alcohol to Methyl Benzoate
In a 250-mL three-neck flask were placed a magnetic stir bar, 60 mL
of anhydrous dichloromethane, 39.0 mL (963 mmol) of anhydrous methyl
alcohol, and 22.46 g (96.6 mmol) of 1. After approximately 10 minof
stirring, 10.28 g (10 mL, 95.1 mmol) of benzyl alcohol was added. The
flask was flushed with nitrogen, covered with foil to keep out light, and
placed ina cold-water bath ( ꢂ2ꢀC at start of the reaction). After approxi-
mately 24 h, excess TCICA was destroyed by the slow additionof
saturated aqueous sodium hydrogen sulfite until a negative test with
wet potassium iodide-starch test paper was achieved. The cyanuric acid
precipitate was removed by vacuum filtrationand the solid was washed
with pentane. Most of the solvent was removed from the filtrate with
a rotary evaporator and the residue was diluted with 60 mL of pentane.
The pentane solution was washed with 1 N NaOH (20 mL), saturated
NaCl (20 mL), and dried over anhydrous magnesium sulfate. After filtra-
tion and concentration, the crude product was vacuum distilled [b.p.
96.0–97.8ꢀC (26.4–30.3 torr)] through a concentric tube column to give
10.16 g (79%) of methyl benzoate. Analysis by GC showed a purity of
99.6%, and the retention time was identical to that of an authentic
sample. The IR and 1H-NMR spectra were identical to that of an authen-
tic sample.
Oxidation of 1,4-Butanediol to g-Butyrolactone
In a 50-mL three-neck flask were placed a magnetic stir bar, 30.0 mL
of anhydrous dichloromethane, 0.4544 g (5.042 mmol) of 1,4-butanediol,

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Hiegel and Gilley
0.90 mL (11.2 mmol) of pyridine, and 1.2899 g (5.550 mmol) of 1. The
flask was flushed with nitrogen, covered with foil to keep out light, and
refluxed using a temperature-controlled oil bath. After approximately 5 h,
excess TCICA was destroyed by the slow additionof saturated aqueous
sodium hydrogen sulfite until a negative test with wet potassium iodide-
starch test paper was achieved. The cyanuric acid precipitate was
removed by vacuum filtrationand the solid was washed with dichloro-
methane. The solution was washed with 1 N HCl (15 mL).
Dichloromethane (2 ꢁ 15 mL) was used to back-extract the HCl wash.
The solutionwas thendried over ahnydrous sodium sulfate. After
filtration and concentration, the oily residue was purified by flash
chromatography to give 0.3305 g (76%) of g-butyrolactone. Analysis by
GC showed a purity of 98.4%, and the retention time was identical to
that of an authentic sample. The IR and 1H-NMR spectra were identical
to that of anauthentic sample.
ACKNOWLEDGMENT
This work was supported inpart by anNSF-REU Program grant, a
CSUF Undergraduate Research and Creativity Award, and an award
from the Rohm and Haas Company: Otto Haas Award for Technical
Excellence (courtesy of Robert K. Barr).
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Oxidation Using Trichloroisocyanuric Acid
2009
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Received inthe USA October 17, 2002

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