Jump to main nội dung


Bạn đang xem: Monocarbaborane anion chemistry

Jump khổng lồ site search
*

*

*
Advanced
You vì chưng not have JavaScript enabled. Please enable JavaScript to access the full features of the site or access our non-JavaScript page.

Monocarbaborane anion chemistry. COOH, CH2OH & CHO units as functional groups on ten-vertex monocarbaborane anionic compounds




Xem thêm: Toán 12 Bài 2: Hàm Số Lũy Thừa Lớp 12, Giải Toán 12 Bài 2

a The School of Chemistry of the University of Leeds, Leeds, England, UK

b The School of Natural Sciences (Chemistry), The University of Newcastle-upon-Tyne, England, UK


B10H14 reacts with para-C6H4(CHO)(COOH) in aqueous KOH solution to give the <nido-6-CB9H11-6-(C6H4-para-COOH)>− anion 1, which undergoes cage closure with iodine in alkaline solution lớn give the <closo-2-CB9H9-2-(C6H4-para-COOH)>− anion 2. Upon heating, anion 2 rearranges to form the <closo-1-CB9H9-1-(C6H4-para-COOH)>− anion 3. Similarly, B10H14 with glyoxylic acid OHCCOOH in aqueous KOH gives the <arachno-6-CB9H13-6-(COOH)>− anion 4, which undergoes cage closure with iodine in alkaline solution lớn give the <closo-2-CB9H9-2-(COOH)>− anion 5. Upon heating, anion 5 rearranges to give the <closo-1-CB9H9-1-(COOH)>− anion 6. Reduction of the COOH anions 3 & 6 with diisobutylaluminium hydride gives the CH2OH hydroxy anions <closo-1-CB9H9-1-(C6H4-para-CH2OH)>−7 and <closo-1-CB9H9-1-(CH2OH)>−8 respectively. The <closo-1-CB9H9-1-(C6H4-para-CH2OH)>− anion 7 can also be made via isomerisation of the <closo-2-CB9H9-2-(C6H4-para-CH2OH)>− anion 9, in turn obtained from the <nido-6-CB9H11-6-(C6H4-para-CH2OH)>− anion 10, which is obtained from the reaction of B10H14 with terephthaldicarboxaldehyde, C6H4-para-(CHO)2, in aqueous KOH solution. Oxidation of the hydroxy anions 7 and 8 with pyridinium dichromate gives the aldehydic <closo-1-CB9H9-1-(C6H4-para-CHO)>− anion 11 & the aldehydic <closo-1-CB9H9-1-(CHO)>− anion 12 respectively, characterised as their 2,4-dinitrophenylhydrazone derivatives, the <closo-1-CB9H9-1-C6H4-para-CH" />N–NHC6H3(NO2)2>− anion 13 and the <closo-1-CB9H9-1-CH" />N–NHC6H3(NO2)2>− anion 14 respectively.