Process for the preparation of novel stabilized phosphorus ylides

摘要

The present invention relates to novel stabilized phosphorous ylides and processes for their preparation. More particularly, the present invention relates to a process for substituting the carbonyl oxygen of 2- formyl- or 2-oxoalkylidenetriphenyl-phosphoranes (OATP) by other stabilizing groups to form novel compounds having an increased tendency to form complexes or compounds which absorb in the visible region of the spectrum.PPThe compounds according to the present invention arePPCompounds of the formula (1) P PPh.sub.3 ═CH-- C(R)═Nu (1)PP wherein R is hydrogen, a C.sub.1 -C.sub.5 -alkyl, C.sub.1 -C.sub.3 - fluoroalkyl or perfluoroalkyl radical, an unfluorinated or fluorinated C. sub.6 -C.sub. 14 -aryl radical or a group OCH.sub.3 ; andP PNu is S, Se, C(CN).sub. 2, NH, PhN, PhNHN, ##STR1## or a radical of the formulae (a), (b), (c), (d) or (e) ##STR2## wherein Z is C(CH.sub.3). sub.2, S or N(CH. sub.3) and n=1 or 2 (provided that the combinations R═Ar, SAlk or OAlk and Nu. dbd.NPh, and the combinations R═H, Alk or aryl and Nu. dbd.S are excluded) are disclosed, as well as methods for making them.