One‐Pot Approach to Organo‐Phosphorus–Chalcogen Macrocycles Incorporating Double OP(S)SC_n or OP(Se)SeC_n Scaffolds: A Synthetic and Structural Study

Diversity of Lawesson's Reagent: Advances and Scope

“…Woollins et al. disclosed an excellent one‐pot methodology to construct a library of attractive organo phosphorus‐chalcogen macrocycles using Lawesson's and Woollins’ reagents (selenium counterpart of 1 ) . Considering the topic of this review herein we only revealed the findings related with 1 .…”

“…Woollins et al disclosed an excellent one-pot methodology to construct a library of attractive organo phosphorus-chalcogen macrocycles using Lawesson's and Woollins' reagents (selenium counterpart of 1). [13] Considering the topic of this review herein we only revealed the findings related with 1. The routes involved nucleophilic addition of disodium alkane-bis (olate)s, obtained from dialcohols (36) and NaH, followd by treatment with an equimolar amount of dibromides (37).…”

Synthesis and Structural Study of Novel Selenation Derivatives of N, N‐Dialkylcyanamides

“…However, the synthesis of selenium‐containing organic heteroatom compounds is not always easy due to the inconvenience of typical selenium reagents such as H 2 Se, NaHSe, (Me 3 Si) 2 Se, potassium selenocyanate and tetraethylammonium tetraselenotungstate [Et 4 N] 2 WSe 4 , each presenting its own problems including toxicity, solubility, difficulty in handling and poor reactivity. 2,4‐Bis(phenyl)‐1,3‐diselenadiphosphetane‐2,4‐diselenide {[PhP(Se)( μ ‐Se)] 2 , known as Woollins’ reagent, WR } has been applied as a highly efficient selenation agent or synthetic precursor for the synthesis of a range of selenium‐containing compounds from simple oxygen‐selenium exchange to complex phosphorus‐selenium heterocycles as well as the surprising phosphorus‐selenium‐free products by virtue of its less unpleasant chemical properties and ready preparation/handling in air . In continuation of our investigation into the reactivity of Woollins’ reagent towards different organic substrates, herein, we report the formation of a series of 4‐(dialkylamino)‐2,5‐diphenyl‐1,3,2,5‐selenazadiphosphole 2,5‐diselenides, 1,1‐dialkylselenoureas and 1,3‐selenazol‐2‐amines by the reactions of N, N ‐dialkylcyanamides with Woollins’ reagent, followed by cyclisation with the corresponding α ‐haloketones and nine single crystal X‐ray structures.…”

Application of four-membered ring chalcogenation reagents to the synthesis of new phosphorus-chalcogen heterocycles

“…[17][18][19][20][21][22][23][24][25] Very recently, we have reported these chalcogenation reagents used as efficient building blocks for the synthesis of a series of phosphorus-chalcogen macrocycles incorporating two phosphorus atoms and four chalcogen atoms [X 2 -P 2 -X 2 (X = O, S, Se)] in the central ring. [26][27][28] In order to enrich further the library of organo phosphorus-chalcogen heterocycles, herein we report the preparation of a series of small organo phosphorus-chalcogen heterocycles from the reaction of chalcogenation reagents (LR, FcLR and WR) with alkyl-dithiol or aryl-dithiols, and five representative X-ray structures.…”