Page 1. Tetrahedron Letters,Vol.24,No.G,pp 613-616,1983 0040-4039/83/060613-04$03.00/ O Printed in Crest Britain ... reacts smoothly with some proton acids such as melonic ester 2, p-toluene- ... 614 Treatment of DHA with excess ofi (IOOO, 6 hr) followed by vacuum distil- ...