... After addition of a solution of sodium carbon- ate (1 ml; 2 M) and tetrakis(triphenylphosphino) palladium catalyst (4 mg), the ... 13C NMR (62.5 MHz, RT), d (ppm) \ 13.11; 22.13; [2H 8 ]THF, 22.20; 23.31; 23.63; 23.95; 24.27; 24.59; 28.95; 29.04; 29.26 ... M n \ 3183; M w \ 6305; P n \ 4; ...