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Front Cover: Basicity of N ‐(Tetramesityltetraphosphacyclopentylidene)cyclohexylamine: An Unusual Diphospha(III)guanidine Derivative (Eur. J. Inorg. Chem. 45/2017)
Author(s) -
Adhikari Anup Kumar,
Grell Toni,
Lönnecke Peter,
HeyHawkins Evamarie
Publication year - 2017
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201701328
Subject(s) - chemistry , guanidine , front cover , moiety , protonation , cyclohexylamine , reactivity (psychology) , medicinal chemistry , derivative (finance) , cover (algebra) , nitrogen atom , computational chemistry , stereochemistry , organic chemistry , ring (chemistry) , ion , mechanical engineering , medicine , alternative medicine , pathology , financial economics , engineering , economics
The Front Cover shows the p K a value of the unusual cyclic hetero‐oligophosphane cyclo ‐P 4 Mes 4 C(NCy), whose C–N double bond does not exhibit the reactivity expected for imines, but can in fact be regarded as part of a substituted diphospha(III)guanidine moiety. According to quantum mechanical calculations, its basicity is comparable to that of methyl‐substituted monophospha(III)guanidine. Thus, the nitrogen atom can be protonated with HCl or HBF 4 . The p K a value of cyclo ‐P 4 Mes 4 C(NCy) was measured by reactions with so‐called indicator bases and is in the range 4.9–5.2 in THF. More information can be found in the Full Paper by E. Hey‐Hawkins et al. For more on the story behind the cover research, see the Cover Profile .