Synthesis of the first fluoro(phosphanyl)- and diphosphanyl-stannanes and surprising formation of [P(SnMe3)4]+ SiF5-.
Monophosphanylation of the difluorostannane Is2SnF2 (Is = 2,4,6-triisopropylphenyl) with Si(PH2)4 furnishes the first isolable fluoro(phosphanyl)stannane Is2Sn(F)PH2 1, which readily undergoes unique SiO2-assisted decompostion to [Is2Sn(PH)]2 2 and HF, while further phosphanylation of 1 leads to the remarkably stable diphosphanylstannane Is2Sn(PH2)2 3; the latter reacts with Me3SnF at the glass-wall to give the first perstannylphosphonium pentafluorosilicate [P(SnMe3)4]+ SiF5- 4.
Chapter 4 – Four-membered ring systems
Publisher Summary This chapter discusses the chemistry of four-membered ring systems. Tremendous advances have been made in the stereo selective synthesis and synthetic applications of strained four-membered ring systems. However, there is still a lot of new four-membered heterocyclic chemistry being continuously reported. This chapter discusses about various synthesis such as azetes, azetines, azetidines, 3-azetidinones, monocyclic 2-azetidinones, fused polycyclic β-lactams, oxetanes, dioxetanes, 2-oxetanones (β-lactones), diazetidines, diazetines, oxazetidines, thiazetidines, thietes, thietanes, dithietanones, dithietes, β-sultams, silicon, and phosphorus heterocycles. Oxygen- and nitrogen-containing heterocycles dominate the field in terms of the number of publications. The structure of the synthesis is shown in this chapter.
First Insights into the Draft Genome Sequence of the Endophyte Paenibacillus amylolyticus Strain GM1FR, Isolated from Festuca rubra L.
ABSTRACT Paenibacillus amylolyticus strain GM1FR is an endophyte isolated from aerial plant tissues of Festuca rubra L. Here, we report the draft genome sequence (7.3 Mb) of GM1FR containing 6,241 protein-coding genes, some of which are potentially involved in plant growth promotion and biocontrol.