Patent ID: 6989457

Claim:
A compound of the formula: wherein: n is an integer having a value of from 1 to 5; each R can be the same or different and each is independently selected fr re the group consisting of D, H, CH 3 , C 2 H 5 , i-C 3 H 7 , C 4 H 9 and Si(R″) 3 wherein each R″ is independently selected from H and C 1 -C 4 alkyl; and each of R′ can be the same or different and each is independently selected f in the group consisting of D, H, C 1 -C 4 alkyl, and Si(R″) 3 wherein each R″ is independently selected from H and C 1 -C 4 alkyl; with the provisos that (i) each of the R groups and R′ are not simultaneously all H, and (ii) when each of R′ is H, and n is 1, both R groups are not simultaneously trimethylsilyl.