El-Sayed, Ibrahim; Abdel-Megeed, Mohamed F.; Yassin, Salah M., Phosphorus, Sulfur and Silicon and the Related Elements, 1994, vol. 86, # 1.4, p. 239 - 258
Studies of the Thiocarbonyl Compounds. I. Syntheses and Thermal Rearrangement of<i>O</i>,<i>S</i>-Diaryl Dithiocarbonates
作者:Yoshiaki Araki
DOI:10.1246/bcsj.43.252
日期:1970.1
S-diaryl dithiocarbonates with the general formula of p-X–C6H4–S–C(=S)–O–C6H4–Y-p (I) were prepared. When these substances were kept at an elevated temperature, they rearranged smoothly to S,S-diaryl dithiocarbonates of this general formula: p-X–C6H4–S–C(=O)–S–C6H4-Y-p (II). Kinetic studies showed that the rearrangement followed fairly good first-order kinetics. The rate constants in diphenyl ether at
Kinetics and mechanism of the reactions of aryl chlorodithioformates with pyridines and secondary alicyclic amines
作者:Enrique A. Castro、Marcela Gazitúa、José G. Santos
DOI:10.1002/poc.1555
日期:2009.11
found. Plots of kobs versus [amine] are linear and pH independent, with slope kN. The Brønsted‐type plots (log kN vs. pKa of aminium ions) are linear for the reactions of PClDTF with SA amines (slope β of 0.3) and pyridines (β = 0.26) and those of NPClDTF with pyridines (β = 0.30). For the reaction of NPClDTF with SA amines the Brønsted‐type plot is biphasic, with slopes β1 = 0.2 (at high pKa) and β2 = 1
The compound of the formula (24):
1
wherein R
9
R
10
may be the same or different and each represent a hydrogen atom or a protecting group.
化学式(24)的化合物:其中R9和R10可以相同或不同,且均表示氢原子或保护基。
16-ene-vitamin D derivatives
申请人:CHUGAI SEIYAKU KABUSHIKI KAISHA
公开号:US20020032340A1
公开(公告)日:2002-03-14
A compound having the formula (4):
wherein
1
X is oxygen or sulfur, R
9
and R
10
are each a hydrogen or a protecting group, and R
11
is an aliphatic hydrocarbon, a —COR
12
group where R
12
is alkyl, aryl or alkoxy, or a group of formula
2
wherein R
5
and R
6
are each hydrogen or hydroxyl, m is 1 to 4, and n is 0-2.