Dipalladaphosphacyclobutanes and a process for preparing the same

Abstract

The invention relates to palladaphosphacyclobutanes of the formula (I) ##STR1## where R.sup.1, R.sup.2 are, independently of one another, hydrogen, (C.sub.1 -C.sub.4)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl, (C.sub.1 -C.sub.4)-alkoxy, fluorine, N[(C.sub.1 -C.sub.4)-alkyl].sub.2, CO.sub.2 -(C.sub.1 -C.sub.4)-alkyl, OCO-(C.sub.1 -C.sub.4)-alkyl or aryl; R.sup.3, R.sup.4, R.sup.5, R.sup.6 are, independently of one another, (C.sub.1 -C.sub.8)-alkyl, (C.sub.3 -C.sub.12)-cycloalkyl or aryl; or where R.sup.1 and R.sup.2, R.sup.1 or R.sup.2 and R.sup.3 or R.sup.4, R.sup.3 and R.sup.4, R.sup.3 or R.sup.4 and R.sup.5 or R.sup.6, or R.sup.5 and R.sup.6 together form an aliphatic ring; or where R.sup.5 and R.sup.6, R.sup.3 or R.sup.4 and R.sup.5 or R.sup.6 together form an aromatic ring; and Y is an anion of an inorganic or organic acid, with the exception of the compounds di-.mu.-chloro-bis[2-[bis(1,1-dimethylethyl)phosphino]-2-methylpropyl-C,P]d ipalladium(II) di-.mu.-bromo-bis[2-[bis(1,1 -dimethylethyl)phosphino]-2-methylpropyl-C,P]dipalladium(II) di-.mu.-trifluoroacetato-bis[2-[bis(1,1 -dimethylethyl)phosphino]-2-methylpropyl-C,P]dipalladium(II) di-.mu.-chloro-bis[2-[(1,1 -dimethylethyl)phenylphosphino]-2-methylpropyl-C,P]dipalladium(II) .mu.-chloro-.mu.-methoxy-bis[2-[bis(1,1 -dimethylethyl)phosphino]-2-methylpropyl-C,P]dipalladium(II).

Dependencies are inferred from the claim text.