Reference

Determination of the number and relative position of tryptophan residues in various albumins

Determination of the number and relative position of tryptophan residues in various albumins. Feldhoff, Richard C.; Peters, Theodore, Jr. (Med. Res. Lab., Mary Imogene Bassett Hosp., Cooperstown, N. Y., USA). Biochem. J., 159(3), 529-33 (English) 1976. CODEN: BIJOAK. DOCUMENT TYPE: Journal CA Section: 9 (Biochemical Methods) Section cross-reference(s): 6 The no. and locations of tryptophan residues in albumin were detd. by cleavage with N-bromosuccinamide followed by polyacrylamide gel electrophoresis in the presence of Na dodecyl sulfate. The no. of new peptide bands appearing in the gel was a function of the no. of tryptophan residues, and the relative migration of the bands permitted calcn. of peptide mol. wts. and an estn. 3493-39-8 and 73-22-3 which are cas registry numbers of substances are two of reagents here. of the positions of the tryptophan residues in the peptide chains. The technique showed that all of 11 mammalian albumins studied contained a tryptophan residue near position 213, whereas albumins of 3 birds studied had no tryptophan. Frog and toad albumins contained 2 tryptophan residues situated at positions different from those in mammalian albumins. .

Addition reactions of bicyclobutane derivatives

Addition reactions of bicyclobutane derivatives. X. Regio- and stereoselectivity of the ring cleavage of 1-phenyltricyclo[4.1.0.02,7]heptane in the presence of electrophiles. Razin, V. V.; Zadonskaya, N. Yu.; Shamurzaev, Kh. T. (Leningr. Gos. Univ., Leningrad, USSR). 139233-13-9 and 52768-28-2 which are cas registry numbers are also used here. Zh. Org. Khim., 27(6), 1253-62 (Russian) 1991. CODEN: ZORKAE. ISSN: 0514-7492. DOCUMENT TYPE: Journal CA Section: 24 (Alicyclic Compounds) The ring cleavage of the title compd. I with Hg(OAc)2 in presence of ROH (R = H, Me) gave bicycloheptanes II [R1 = HgOAc; R2 = RO; R3 = Ph (III)], while the same reaction with N-bromosuccinimide and ROH gave II [R1 = Br; R2 = Ph; R3 = OR (IV)]. Some reactions, e.g., NaBH4 redn. and bromination of III were also studied. The treatment of III with NaBr followed by Br2 gave II (R1 = Br; R2 = OR; R3 = Ph), diastereomers of IV. .