Abstract:Communications to the Editor 5519 deuterium oxide produced allogibberic acid containing 4.67% excess deuterium, as expected from a precursor with an 8,9 double bond (c/. gibberellenic acid6 which has the 1•8 system). Strong, but not rigorous, evidence for the (a) stereochemistry in gibberellic acid as in allogibberic acid is given by the close correspondence in shape and intensity of the rotatory dispersion curve form the seco keto esters derived from the oxidation of ring D of methyl allogibberate and of the … Show more
“…There is also a long interaction (3.4901(5) Å) between Ag(1) and Br(11') on a symmetry related cage in the lattice; this bromine atom approaches Ag(1) approximately trans to Br(12) (Br(12)-Ag(1)-Br(11') 157. 15(1)˝). Although this distance is long, the coordination motif around the silver suggests that it is significant in the solid state.…”
Section: H(b8) Is 2352 å and Ag(1) H(b9) Is 2301 å)mentioning
ianion, the structure of which contains two four-coordinated boron atoms, to very weak M . . . H interactions with the hydride atoms in the case of bulky [3,3 1 -Co(1,2-C 2 B 9 H 11 ) 2 ]´monoanion.
“…There is also a long interaction (3.4901(5) Å) between Ag(1) and Br(11') on a symmetry related cage in the lattice; this bromine atom approaches Ag(1) approximately trans to Br(12) (Br(12)-Ag(1)-Br(11') 157. 15(1)˝). Although this distance is long, the coordination motif around the silver suggests that it is significant in the solid state.…”
Section: H(b8) Is 2352 å and Ag(1) H(b9) Is 2301 å)mentioning
ianion, the structure of which contains two four-coordinated boron atoms, to very weak M . . . H interactions with the hydride atoms in the case of bulky [3,3 1 -Co(1,2-C 2 B 9 H 11 ) 2 ]´monoanion.
“…4 These theoretical studies were then validated by Hawthorne and Pitochelli in a series of reports highlighting the first synthesis of dodecaborate [B 12 H 12 ] 2− as well as decaborate [B 10 H 10 ] 2− species. 5,6 …”
This Viewpoint Article describes major advances pertaining to perfunctionalized boron clusters in synthesis and their respective applications. The first portion of this work highlights key synthetic methods allowing one to access a wide range of polyhedral boranes (B4 and B6 – B12 cluster cores) that contain exhaustively functionalized vertices. The second portion of this Viewpoint showcases the historical developments in using these molecules for applications ranging from materials science to medicine. Lastly, we suggest potential new directions for these clusters as they apply to both synthetic methods and applications.
“…32 ) and 7 (ref. 33 ) were the first syntheses of the closo-skeleton which involved borane insertion 34 or amine-induced dehydrogenation 35 reactions, respectively.…”
Section: Preparation Of the Parent Clustersmentioning
Introduction and transformations of organic functional groups to ten- and twelve-vertex closo-boranes and heteroboranes is reviewed in the context of preparation of liquid crystalline compounds. The review, containing 198 references, is designed as a synthetic manual for materials chemists and focuses on methods for engineering molecules with elongated shapes and variable dipole moments. Several underdeveloped aspects of closo-borane chemistry are identified.
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