Highly enantioselective synthesis of chiral imides and derived products via chiral base desymmetrisation
作者:David J Adams、Alexander J Blake、Paul A Cooke、Christopher D Gill、Nigel S Simpkins
DOI:10.1016/s0040-4020(02)00367-8
日期:2002.6
The enantioselective deprotonation of several ring-fused imides with a chiral base, followed by electrophilic quenching, gives a range of chiral products in good yield and in ≥91% ee. The absolute stereochemistry of two of the products was determined by X-ray crystallography. A number of the imide products were subjected to further, highly regioselective, transformations, including enolate substitution
Certain embodiments are directed to cyanate resin blends comprising, for example, a mixture of a cyanate monomer and a cyanate oligomer. The resin blends are effective to provide a dielectric constant of less than 2.7, a glass transition temperature of at least 150° C. and a moisture absorption of less than 1.5%. Radomes using the resin are also described.