Kinetics of the epoxidation of geraniol and model systems by dimethyldioxirane.
The mono-epoxidation of geraniol by dimethyldioxirane was carried out in various solvents. In all cases, the product ratios for the 2,3 and 6,7 mono-epoxides were in agreement with literature values. Kinetic studies were carried out at 23 degrees C in the following dried solvent systems: acetone (k(2) = 1.49 M(-1)s(-1)), carbon tetrachloride/acetone(9/1, k(2)=2.19 M(-1)s(-1)), and methanol/acetone (9/1, k(2) = 17 M(-1)s(-1)). Individual k(2) values were calculated for epoxidation of the 2,3 and 6,7 positions in geraniol. The non-conjugated diene system was modeled employing two simple independent alkenes:2-methyl-2-pentene and 3-methyl-2-buten-1-ol by determining the respective k(2) values for epoxidation in various solvents. The kinetic results for each independent alkene showed that the relative reactivity of the two epoxidation sites in geraniol as a function of solvent was not simply a summation of the independent alkene systems.
Baumstark
A L
AL
Department of Chemistry, Center for Biotech and Drug Design, Georgia State University, Atlanta, Georgia 30303-3083, USA. chealb@panther.gsu.edu
Franklin
P J
PJ
Vasquez
P C
PC
Crow
B S
BS
D000080462:Acyclic Monoterpenes; D000975:Antioxidants / Q000737:chemistry*; D004852:Epoxy Compounds / Q000737:chemistry*; D007700:Kinetics; D012997:Solvents / Q000737:chemistry; D013729:Terpenes / Q000737:chemistry*
D000080462:Acyclic Monoterpenes; D000975:Antioxidants; D004852:Epoxy Compounds; D012997:Solvents; D013729:Terpenes; C007836:geraniol; C064455:dimethyldioxirane