Solid State Polymerization Process for Polyester with Phosphinic Acid Compounds
申请人:Odorisio Paul
公开号:US20130035451A1
公开(公告)日:2013-02-07
Disclosed are phosphinic acid compounds of formula I, II or III
where R
1
and R
1
′ are for instance straight or branched C
1
-C
50
alkyl, R
2
is for instance straight or branched C
22
-C
50
alkyl, R
3
and R
3
′ are for instance straight or branched C
1
-C
50
alkyl, R
4
is for instance straight or branched C
1
-C
50
alkylene and m is from 2 to 100. Also disclosed are polyester compositions comprising the compounds of formula I, II and III.
reaction does not give the polyvinyl ether but results in [1,3] O to C rearrangement to give the corresponding aldehyde, RCH2CHO in moderate to good yields. The rearrangement selectively proceeds when vinyl ethers having α-substituents are used as the starting materials to give the corresponding ketones in high yields. With catalytic amounts of hydrosilanes, the rearrangement gives ketones or aldehydes selectively
Graphite is found to catalyze acylativecleavage of ethers such as benzylic, allylic, tert-butylic and cyclicethers with acyl halides to give the corresponding esters in good to excellent yields. Benzylic ether was cleaved chemoselectively, when a variety of other functional groups was present, to produce the corresponding ester along with benzyl halide.
Zeolite-promoted benzylation of alcohols with benzyl chloride has been investigated. By use of a series of cation-exchanged zeolites, which have the same crystalline structure but different acid and base properties, it is confirmed that the cooperative function of acid sites and base sites of zeolite is required for the effective benzylation of alcohols although both acid and base strengths are low. It is also found that alcohols show different reactivities in zeolite from those in solution depending on their molecular structures because the benzylation is promoted inside the narrow cavities of zeolite.