tris(dimethylamino)phosphine selenide, esters of selenophosphoric acid, and esters of selenophosphonic acid react with dihalogens and sulfurylchloride to form halogenoselenophosphonium salts (P–SeX)+X−. The latter undergo deselenization via ligand exchange to form phosphonium salts (P–X)+X− and elemental selenium. The stability of these salts depends on the substituents at the phosphorus atom and the type of counter
膦硒化物, 三(二甲氨基)膦硒化物, 酯类 的 硒磷酸, 和 酯类 的 硒代膦酸 与二卤素反应并 硫酰氯到形式halogenoselenophosphonium盐(P-性别)+ X - 。后者通过 配体交换形式鏻盐(P-X)+ X -和元素硒。这些盐的稳定性取决于磷原子上的取代基和抗衡离子的类型。salts盐可能与相应的equilibrium盐处于平衡状态磷烷,这证明了 酯类含有邻亚苯基配体。salts盐的结构,磷烷 和其他磷化合物的支持 31 P NMR光谱数据和电导率。其他证据来自卤代硒代phosph盐与环己烯。
A Mild One-Pot Reduction of Phosphine(V) Oxides Affording Phosphines(III) and Their Metal Catalysts
作者:Łukasz Kapuśniak、Philipp N. Plessow、Damian Trzybiński、Krzysztof Woźniak、Peter Hofmann、Phillip Iain Jolly
DOI:10.1021/acs.organomet.0c00788
日期:2021.3.22
metal-free reduction of a range of phosphine(V) oxides employing oxalyl chloride as an activating agent and hexachlorodisilane as reducing reagent has been achieved under mild reaction conditions. The method was successfully applied to the reduction of industrial waste byproduct triphenylphosphine(V) oxide, closing the phosphorus cycle to cleanly regenerate triphenylphosphine(III). Mechanistic studies and quantum
PROCESSES FOR PREPARING 4-METHYL-5-NONANONE AND 4-METHYL-5-NONANOL
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:US20200199053A1
公开(公告)日:2020-06-25
The present invention provides a process for preparing 4-methyl-5-nonanone of the following formula (3), the process comprising at least a step of subjecting pentanoic anhydride of the following formula (1) and a 2-pentyl nucleophilic reagent of the following general formula (2), in which M represents Li, MgZ
1
, or ZnZ
1
, wherein Z
1
represents a halogen atom or a 2-pentyl group, to a nucleophilic substitution reaction to produce 4-methyl-5-nonanone (3), as well as a process for preparing 4-methyl-5-nonanol of the following formula (7), the process comprising at least steps of preparing 4-methyl-5-nonanone and subjecting the obtained 4-methyl-5-nonanone and a reducing agent to a reduction reaction to produce 4-methyl-5-nonanol (7).
Saccharin Aza Bioisosteres—Synthesis and Preclinical Property Comparisons
作者:Yantao Chen、Carl-Johan Aurell、Anna Pettersen、Richard J. Lewis、Martin A. Hayes、Matti Lepistö、Anna C. Jonson、Hanna Leek、Linda Thunberg
DOI:10.1021/acsmedchemlett.7b00137
日期:2017.6.8
Saccharin is a well-known scaffold in drug discovery. Herein, we report the synthesis and preclinical property comparisons of three bioisosteres of saccharin: aza-pseudosaccharins (cluster B), and two new types of aza-saccharins (clusters C and D). We demonstrate a convenient protocol to selectively synthesize products in cluster C or D when primary amines are used. Preclinical characterization of
Long sought synthesis of quaternary phosphonium salts from phosphine oxides: inverse reactivity approach
作者:Anna C. Vetter、Kirill Nikitin、Declan G. Gilheany
DOI:10.1039/c8cc02173b
日期:——
Quaternary phosphonium salts (QPS), a key class of organophosphorus compounds, have previously only been available by routes involving nucleophilic phosphorus. We report the realisation of the opposite approach to QPS utilising phosphine oxides as the electrophilic partner and Grignard reagents as nucleophiles. The process is enabled through the crucial intermediacy of the derived halophosphonium salts