Patent ID: 8709615

Claim:
A compound having the formula: wherein the number of carbon atoms in R 1 is at least 2; wherein R 1 is alkyl and R 2 is hydrogen; wherein R 3 , R 4 , R 5 , R 6 are optionally linked; wherein R a and R b represent mono-, di-, tri- or tetra-substitution; wherein X is selected from the group consisting of PR, C═O, S═O, SO 2 , CRR′, SiRR′ and GeRR′; wherein R a , R b , R, R′, R 3 , R 4 , R 5 , and R 6 are independently selected from the group consisting of hydrogen, deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and wherein n is 1 or 2.