Hydroboronation. of the three double bonds in triallylamine yields a tricyclic compound (I) with bridgehead nitrogen and boron atoms and a direct B-N bond; it is an unreactive, volatile solid which hydrolyses slowly to dipropylaminopropylboronic acid (11) and tripropylamine. Hydroboronation of triallylborane yields the analogous bicyclic dibora-compound (IV) which is highly reactive and forms adducts with nitrogen donors.The infrared spectrum of azaboratricycloundecane is compared with those of triethanolamine borate and trisethyleneglycol diborate, and its boron and proton n.m.r. spectra are also elucidated.
Ammonia reacts with decaborane in benzene solution to give a triammoniate identical with that formed as a major product from decaborane and ammonia gas. The structure of this compound and of the substance formed from it by the action of heat have been examined. The latter is shown to be diammoniadecaborsne, B1,Hl,(NH,),, whilst the triammoniate is best formulated as NH,+[B1,H1,.NH,,NH,]-.BioHi4,3NH, BioHisNa (1) + NH, f Ha Further confirmation is obtained from the infrared (i.r.) spectrum, Fig. 2. l Part VIII,
The intercondylar notch of the knee is a relatively small area with numerous rare pathologies that can arise in this region. A majority of the existing literature has focused on the cruciate ligament injuries yet there are several other entities that can cause knee pain from within the intercondylar notch. This review focuses on identifying the various diagnostic and treatment options for rare benign and malignant lesions including ganglion cyst formation, mucoid degeneration, benign proliferative conditions and intra-articular tumors. These entities are most often diagnosed with advanced imaging studies and treated arthroscopically. While rare, these pathologies are important to identify in patients with ongoing vague knee pain.
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