Electron impact mass spectrometry of 2,2-disubstituted-1,3-benzoxathioles and spiro [1,3-benzoxathioles-2,1′-cycloalkanes]
摘要:
AbstractThe electron impact mass spectrometric behaviour of a series of 2,2‐disubstituted‐1,3‐benzoxathioles and spiro[1,3‐benzoxathioles‐2,1′‐cycloalkanes] has been studied in detail with the aid of linked scans and exact mass measurements. The structures of the more interesting fragment ions have been confirmed by collisional activation experiments. A precise analogy with the chemical degradative processes, obtained by the action of Grignard reagents on these compounds, is emphasized.
309. Benz-1 : 3-oxathioles, benz-1 : 4-oxathien, and αω-bisarylthioalkanes
作者:Douglas Greenwood、Herbert A. Stevenson
DOI:10.1039/jr9530001514
日期:——
POLYMERIZABLE COMPOSITION AND OPTICALLY ANISOTROPIC BODY USING SAME
申请人:DIC Corporation
公开号:US20180002460A1
公开(公告)日:2018-01-04
The polymerizable composition contains: a) a polymerizable compound having one or two or more polymerizable groups and satisfying formula (I):
Re(450 nm)/Re(550 nm)<1.0 (I);
b) at least one photopolymerization initiator selected from the group consisting of alkylphenone-based compounds, acylphosphine oxide-based compounds, and oxime ester-based compounds; and c) a polymerization inhibitor. The present invention also provides an optically anisotropic body, a retardation film, an antireflective film, and a liquid crystal display device that are produced using the polymerizable liquid crystal composition. The polymerizable composition of the present invention is excellent in solubility and has high storage stability, so that no precipitation of crystals etc. occurs. When a film-shaped polymer is produced by polymerizing the above composition, the unevenness of the surface of the coating film is small while the alignment of the liquid crystal is maintained, and high durability is obtained. Therefore, the polymerizable composition is useful.
Electron impact mass spectrometry of 2,2-disubstituted-1,3-benzoxathioles and spiro [1,3-benzoxathioles-2,1′-cycloalkanes]
AbstractThe electron impact mass spectrometric behaviour of a series of 2,2‐disubstituted‐1,3‐benzoxathioles and spiro[1,3‐benzoxathioles‐2,1′‐cycloalkanes] has been studied in detail with the aid of linked scans and exact mass measurements. The structures of the more interesting fragment ions have been confirmed by collisional activation experiments. A precise analogy with the chemical degradative processes, obtained by the action of Grignard reagents on these compounds, is emphasized.