Detail of "513-31-5"

Reference

The synthesis of fused and bridged ring systems by free radical carbocyclization

The synthesis of fused and bridged ring systems by free radical carbocyclization. A general route to masked 1,4-diketones. Marinovic, N. N.; Ramanathan, H. (Dep. Chem., City Univ. New York, New York, NY 10031, USA). Tetrahedron Lett., 24(18), 1871-4 (English) 1983. CODEN: TELEAY. ISSN: 0040-4039. DOCUMENT TYPE: Journal CA Section: 24 (Alicyclic Compounds) Section cross-reference(s): 23 Fused and bridged ring systems were prepd. by the intramol. addn. of vinyl radicals to a,b-unsatd. carbonyl compds. E.g., alkylation of the Li enolate of 3-ethoxy-2-cyclohexenone with ICH2CH:C(I)Me followed by redn. 5323-87-5 and 513-31-5 which are cas registry numbers of chemicals are mentioned. gave 71% cyclohexenone I, which underwent intramol. vinyl radical addn. to give 85% bicyclononenone II on treatment with Bu3SnH in C6H6 contg. AIBN at 80°. This procedure was used to prep. the tricyclic compd. III, the skeleton of (12S)-7,12-secoishwaran-12-ol, from 5-methoxytetralone. .

Normal coordinate analysis of some 2,3-dihalo-1-propenes

Normal coordinate analysis of some 2,3-dihalo-1-propenes. Schei, S. H. (Dep. Chem., Univ. Trondheim, Trondheim N-7000, Norway). Spectrochim. Acta, Part A, 39A(12), 1043-8 (English) 1983. CODEN: SAMCAS. ISSN: 0584-8539. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Normal coordinate calcns. using relatively simple valence force fields were performed on H2C:CBrCH2Cl and H2C:CXCH2X (X = Cl, Br). The valence force fields of 2- and 3-halo substituted propenes showed good transferability for the gauche conformers, torsion angle 120°.In this article, certain chemicals are used. Some of their cas registry numbers are 78-88-6 and 513-31-5 The av. deviation between gauche calcd. and obsd. frequencies was 10-15 cm-1 without adjustment of force consts. For the anti conformers, the Csp2- and Csp3-halogen stretches were highly mixed in the normal modes. This indicates an increase in vibrational coupling between the satd. and unsatd. parts of the mol. when passing from gauche to anti conformer. Relative values of torsional force consts. obtained from mol. mechanics calcns. reproduced the obsd. gauche torsional frequencies well. .