Abstract:
The work of Conant a) Conant and Kamerling, JACS, 1931, 53, 3522; A., 1931, 1310. b) Conant, Chow and Dietz, ibid, 1934, 56, 2185; A., 1934, 1371. C) Conant and Werner, ibid, 1930, 52, 449; A., 1931, 40. d) Conant and Chow, ibid, 1933, 55, 3745; A. 1933, 1121. Hans Fischer, Linstead, Chem. Soc. Ann. Reports, 1935,32,362-393; 1937,34,370-386. Stoll and their collaborators, establishes the fact that the chlorins derived from natural sources are hydroporphyrins. This may also be applied to the important phorbides of the chlorophyll series, which contain the isocyclic ring connecting the 6 and V-carbon atoms. It is generally held that the chlorins and phorbides are at the di-hydro level as first postulated for chlorophyll by Stoll and Wiedemann Stoll and Wiedermann, Naturwiss, 1932, 20, 706; Helv. Chim. Acta, 1933, 16, 183.
