Reference

Macrocyclic esters

Macrocyclic esters. (Nisso Petrochemical Industries Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58150587 A2 7 Sep 1983 Showa, 7 pp.Chemicals with cas numbers 693-23-2 and 107-21-1 also play role. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C07D321-00. ICA: A61K007-46. APPLICATION: JP 82-32437 3 Mar 1982. DOCUMENT TYPE: Patent CA Section: 28 (Heterocyclic Compounds (More Than One Hetero Atom)) Macrocyclic esters I (R, R1 = H, Me, Et; m = 6-14) were prepd. from linear esters of repeating units [OCHRCHR1O2C(CH2)mCO] during which diols or oligoesters were added. Thus, a mixt. of 244 parts brassylic acid and 124 parts HO(CH2)2OH was heated 3 h at 150-220° to give viscous monoester, which (142 parts) was heated with 0.2 part Bu2SnO at 240° in vacuo during which the amt. of HO(CH2)2OH distd. was added to the reactor to give 129 parts ethylene brassylate (I; R = R1 = H, m = 11). Similarly prepd. were 2 addnl. I (R = R1 = H, m = 10; R = Me, R1 = H, m = 10). .

Pentacoordinated molecules

Pentacoordinated molecules. 52. A pseudorotational coordinate for five-coordinated silicon. Synthesis and molecular structure of cyclic anionic silicates isoelectronic with phosphoranes. Holmes, Robert R.; Day, Roberta O.; Harland, John J.; Sau, Arjun C.; Holmes, Joan M. (Dep. Chem., Univ. Massachusetts, Amherst, MA 01003, USA). Organometallics, 3(3), 341-7 (English) 1984. CODEN: ORGND7. ISSN: 0276-7333. DOCUMENT TYPE: Journal CA Section: 29 (Organometallic and Organometalloidal Compounds) Section cross-reference(s): 75 [H3N(CH2)6NH3]2+ [(C2H4O2)2SiPh]- (I) and Et4N+ [(C6Cl4O2)2SiPh]- (II) were synthesized and their x-ray structures established. I has a structure displaced 72% from a trigonal bipyramidal (TBP) to a rectangular pyramid (RP). II is nearly a rectangular pyramid (RP), being 90% so displaced. A quant. assessment of structural distortion for I and II and related anionic silicates shows that these pentacoordinated compds.There are some commonly used reagents with their cas registry numbers 107-21-1 and 88200-63-9 in this article. form a continuous series of structures, similar to phosphoranes, between the trigonal bipyramid and square or rectangular pyramid along the Berry pseudorotational pathway. The idealized RP geometry is approached when 2 5-membered unsatd. rings are present with like ligands in any 1 ring attached directly to Si. The existence of this low-energy coordinate indicates the presence of nonrigid character comparable to that found for phosphoranes. I forms monoclinic crystals with each half cation taken into the other half by an inversion operation. There is extensive H bonding between the amino atoms of the cations and the O atoms of the anions. .