Synthesis of a cyclic fluorodialkylaminophosphine and its coordination with boron acids. Formation of a unique dialkylaminophosphine cation

2‐Halogeno‐1,3,2‐diazaarsolenes and 2‐halogeno‐1,3,2‐diazastibolenes: Examples for spontaneous EX bond heterolysis or not?

“…Cations containing a positively charged, lowcoordinate group-15 element (I) have, since the discovery of the first stable phosphenium ions (I, E = P) [1,2] some 30 years ago, remained in the focus of research [3]. A great deal of the interest in these species was-and still is-initiated by their capability to act as ligands in transition metal complexes with similar molecular and electronic structures as Fischercarbene complexes [4], and in particular to stabilize electrophilic complexes with late metal atoms [5,6].…”

“…A great deal of the interest in these species was-and still is-initiated by their capability to act as ligands in transition metal complexes with similar molecular and electronic structures as Fischercarbene complexes [4], and in particular to stabilize electrophilic complexes with late metal atoms [5,6]. Although the major part of work has been dedicated to phosphenium ions [1], cations with other group-15 elements were also studied, and today stable cations centered at dicoordinate nitrogen (I, E = N [7]), arsenic (I, E = As [8][9][10]), antimony (I, E = Sb [11]), and bismuth atoms (I, E = Bi [11]) are known as well (Scheme 1).…”

Urea – boron trihalide adducts. IV. Ionic–covalent equilibria in the tetramethylthiourea–BF3 and tetramethylselenourea–BF3 systems and the influence of B2F7− formation

“…B1F7-has previously been shown to stabilize an excess-BF3-containing adduct in a special case involving fluoride abstraction from the Lewis base (19). Additional unstable BF3-containing anions analogous to B2F7-, have been reported previously.…”

From the Lithium‐2‐anilide‐2‐fluoro‐1,3‐diaza‐2‐sila‐cyclopentene‐GaCl3 Adduct to 1,4,6‐Triaza‐5‐gallium‐7‐sila‐cyclo‐3‐heptene ‐ Experimental and Quantum‐chemical Results

“…All non-hydrogen atoms could be refined anisotropically and the disorder was described appropriately. 149.7(6) 148.8 N(2)-C (7) 147.8 (6) 142.4…”

“…Therefore it is understandable that a widely used method for preparing compounds with low-coordinated elements takes advantage of reactions between halogeno substituted elements and Lewis acids. This led to the syntheses of the first phosphenium [6] and borenium [7] cations, N P N PF 6 B R R BBr 4 as well as to the stabilisation of imino-borenes [8][9][10] and silenes, [11 ,12 ] …”