| abstract |
The invention relates to diphosphines of the general formula DOLLAR F1 where R · 1 · and R · 2 · are each the same or different (C¶1¶-C¶18¶) alkyl radicals, (C¶6¶-C¶14¶) -Aryl radicals, (C¶7¶-C¶24¶) -alakaryl radicals or (C¶7¶-C¶24¶) -arylaryl radicals, R · 3 · hydrogen or a radical -CHR · a · R · b · in which R · a · and R · b · each represent the same or different hydrogen, (C¶1¶-C¶18¶) -alkyl-, (C¶1¶-C¶8¶) -Alkoxy residues, unsubstituted or substituted with (C¶1¶-C¶10¶) alkyl and / or (C¶1¶-C¶10¶) alkoxy residues (C¶6¶-C¶14 ¶) aryl residues or (C¶7¶-C¶24¶) aralkyl residues, and R · 4 · (C¶1¶-C¶10¶) alkyl residues, (C¶6¶ -C¶14¶) aryl residues, (C¶7¶-C¶24¶) aralkyl residues or (C¶7¶-C¶24¶) alkylaryl residues, and a process for their preparation and their use as ligands in organometallic catalysis. |