Reference

Gas chromatographic analysis of L-ascorbic acid by silylation

Gas chromatographic analysis of L-ascorbic acid by silylation. Murota, Satoko; Watanabe, Teizo (Kobe Women's Coll.Several substances are used for example 999-97-3 and 50-81-7 which are their cas registry numbers., Kobe 654, Japan). Kobe Joshi Daigaku Kiyo, 14, 105-9 (Japanese) 1982. CODEN: KJDKDJ. DOCUMENT TYPE: Journal CA Section: 80 (Organic Analytical Chemistry) Section cross-reference(s): 34 The conditions of trimethylsilylation of L-ascorbic acid (I) for gas chromatog. were investigated. I (5-15 mg) was dissolved in anhyd. pyridine (1 mL); hexamethyldisilazane (0.5 mL) and chlorotrimethylsilane (0.05 mL) were added. The soln. was heated to 50° for 20 min, and then the reaction product was dild. with 5 mL pyridine. This soln. (2 mL) was injected into a gas chromatograph, connected with a 3-mm ′ 2-mm glass column packed with 2% OV-17/Gas Chrom Q (temp. progaming from 220 to 240°) and a flame ionization detector. A linear relation between the peak heights and the wt. of I was obtained. The effects of excess reagent removal from the reaction product in a N stream, reaction temp., and quantities of reagents were examd. .

The molecular structure and conformation of hexamethyldisilazane, NH(SiMe3)2, as determined by gas phase electron diffraction

The molecular structure and conformation of hexamethyldisilazane, NH(SiMe3)2, as determined by gas phase electron diffraction. Fjeldberg, Torgny (Coll. Arts Sci., Univ. Trondheim, Dragvoll N-7055, Norway). 999-97-3 are also occured in this study. J. Mol. Struct., 112(1-2), 159-67 (English) 1984. CODEN: JMOSB4. ISSN: 0022-2860. DOCUMENT TYPE: Journal CA Section: 29 (Organometallic and Organometalloidal Compounds) The title study indicated that the SiMe3 groups are close to staggered with respect to each other when viewed along the Si...Si vector; one SiMe3 group is twisted 13(4)° while the other SiMe3 group is twisted 37(3)° in the opposite direction away from the ref. position where Si-C bonds eclipse the N-H bond. The Me groups are twisted 19(6)° (mean value) away from their staggered ref. positions. Principal bond lengths and valence angles are( N-Si 1.738(5) ?, Si-C 1.876(1) ?, SiNSi 131.3(1.5)°, NSiC 110.7(0.5)° (mean value) and SiCH 111.2(0.8)°. .