Polyphosphoramidite oligomers and stabilizer compositions thereof

DETAILED DESCRIPTION The polyphosphoramidite oligomers may be represented by the formula ##STR1## wherein: A is a nitrogen radical ##STR2## wherein R.
sub.
1 is an alkyl radical containing 1 to 4 carbon atoms, ##STR3## wherein a is 3 to 6, or ##STR4## where B is --O--, --S--, or --NR; R.
sub.
2 and R.
sub.
3 are hydrogen, primary, secondary or tertiary alkyl radicals containing 1 to 4 carbon atoms; and perferably R.
sub.
3 is an alkyl radical, more preferably t-butyl; X is >CH.
sub.
2, >CHCH.
sub.
3, >CHCH.
sub.
2 CH.
sub.
3, >CHCH.
sub.
2 CH.
sub.
2 --CH.
sub.
3, >C(CH.
sub.
3).
sub.
2, --O--, --S--, >SO, or >SO.
sub.
2 ; Y is H or ##STR5## wherein Q is Cl or OH; Z is Cl, OH, or ##STR6## wherein R.
sub.
2, R.
sub.
3 and X have the meanings given above; and n is 2 to 10.
More preferably, in (1) R.
sub.
1 contains 4 carbon atoms; in (2) a is 4 to 5; in (3) B is --O--; R.
sup.
3 is t-butyl; X is >CHCH.
sub.
2 CH.
sub.
3, >C(CH.
sub.
3).
sub.
2 or >CHCH.
sub.
2 CH.
sub.
2 CH.
sub.
3 ; in Y Q is OH; Z is OH or ##STR7## and n is 2 to 5.
The oligomeric phosphoramidites are prepared by the reaction of N-dichlorophosphinoamines with bisphenols in the presence of an alkyl amine.
The N-dichlorophospinoamines have the formula A-P-CL.
sub.
2 wherein A is ##STR8## wherein R.
sub.
1 is an alkyl radical containing 1 to 4 carbon atoms, ##STR9## wherein a is 3 to 6 or ##STR10## wherein B is --O--, --S--, or NR.
sub.
1.
Representative N-dichlorophospinoamines are N-dichlorophospino-dimethylamine, N-dichlorophospinodiethylamine, N-dichlorophospino-dipropylamine, N-dichlorophospino-diisopropylamine, N-dichlorophospino-di-n-butylamine, N-dichlorophospino-di-isobutylamine, N-dichlorophospino-di-isobutylamine, N-dichlorophospinoazetidine, N-dichlorophospino-pyrrolidine, N-dichlorophospino-piperidine, N-dichlorophospino-morpholine, N-dichlorophospino-thiomorpholine, and the like.
The bisphenols have the formula ##STR11## wherein R.
sub.
2 and R.
sub.
3 are hydrogen, a primary, secondary or tertiary alkyl radical containing 1 to 4 carbon atoms and X is >CH