3-O-didecanoylglycerol compounds were prepared – starting from a C-4 chiral synthon, 3-buten-1,2-diol – and treated with n-pentylphosphonic dichloride and p-nitrophenol to afford the corresponding diastereomeric phosphonates, which were acylglycerol analogs. Subsequent separation of each of the phosphonate diastereomers A/B or ent-A/ent-B, performed by HPLC, led to four enantiopure stereoisomers that will be
Diels−Alder Reactions of Epoxybutene Derivatives and Subsequent Synthetic Manipulations of the Cycloadducts
作者:Marion A. Franks、John A. Hyatt、Mark E. Welker
DOI:10.1021/op010219d
日期:2001.9.1
Diels-Alder reactions between cyclopentadiene, cyclohexadiene, and a number of epoxybutene derivatives are reported. The endo diastereomer from the Diels-Alder reaction of cyclopentadiene with 2,5-dihydrofuran was functionalized by additional oxidative transformations.
Process for preparing ethylene interpolymers and ethylene interpolymers obtained therefrom
申请人:WESTLAKE LONGVIEW CORPORATION
公开号:EP1195393B1
公开(公告)日:2010-04-07
Stereoselectivity of intramolecular cyclisations of nitrones derived from 3-oxahept-6-enals
作者:Michael B. Gravestock、David W. Knight、Jennifer S. Lovell、Steven R. Thornton
DOI:10.1039/a905802h
日期:——
Intramolecular [1,3]-dipolar cycloadditions of nitrones 33, derived from 3-oxahept-6-enals 7, substituted at either the 4- or 5-position and prepared using a variety of approaches, give good to excellent yields of the cycloadducts 34–37, with good levels of stereoselectivity, especially when the substituent is adjacent to the alkene. The cyclisations appear to proceed via well-defined transition state conformations which should be of predictive value.