C. Ohm et E. Breitmaier, ANSA-PORPHYRINES WITH AN ALKYL CHAIN, A P YRIDINE OR A 2ND PORPHYRINEIN THE BRIDGE, Journal fur praktische Chemie, Chemiker-Zeitung, 336(6), 1994, pp. 530-533
Porphyrines 1, 2a and 2b with an alkyl chain, a pyridine or an additio
nal porphyrine in the bridge are prepared in yields between 5 and 24 %
by condensation of appropriate chains 5 and 6 containing two terminal
benzaldehyde functions with 3,3'-diethyl-4,4'-dimethyl-2,2dipyrrylmet
hane 7. The synthesis of the dialdehydes 5 and 6 is also described.