Previously unknown 1,3,5,8-tetramethyl-6,7-di[2'-(closo-monocarbon carboran
e-1"-yl caesium)methoxycarbonylethyl]porphyrin and 1,3,5,8-tetramethyl-2,4-
divinyl-6,7-di[2-(closo-monocarbon carborane-1"-yl caesium)methoxycarbonyle
thyl]porphyrin were synthesised in the reactions of deuteroporphyrin IX and
protoporphyrin IX, respectively, with (1-hydroxymethyl-closo-monocarbon ca
rborane)caesium.