Severity: Warning
Message: file_get_contents(https://...@pubfacts.com&api_key=b8daa3ad693db53b1410957c26c9a51b4908&a=1): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests
Filename: helpers/my_audit_helper.php
Line Number: 176
Backtrace:
File: /var/www/html/application/helpers/my_audit_helper.php
Line: 176
Function: file_get_contents
File: /var/www/html/application/helpers/my_audit_helper.php
Line: 250
Function: simplexml_load_file_from_url
File: /var/www/html/application/helpers/my_audit_helper.php
Line: 3122
Function: getPubMedXML
File: /var/www/html/application/controllers/Detail.php
Line: 575
Function: pubMedSearch_Global
File: /var/www/html/application/controllers/Detail.php
Line: 489
Function: pubMedGetRelatedKeyword
File: /var/www/html/index.php
Line: 316
Function: require_once
A series of unprecedently air-stable (tricyanoboryl)plumbate anions was obtained by the reaction of the boron-centered nucleophile B(CN) with triorganyllead halides. Salts of the anions [R PbB(CN) ] (R=Ph, Et) were isolated and found to be stable in air at room temperature. In the case of Me PbHal (Hal=Cl, Br), a mixture of the anions [Me Pb{B(CN) } ] (n=1, 2) was obtained. The [Et PbB(CN) ] ion undergoes stepwise dismutation in aqueous solution to yield the plumbate anions [Et Pb{B(CN) } ] (n=1-4) and PbEt as by-product. The reaction rate increases with decreasing pH value of the aqueous solution or by bubbling O through the reaction mixture. Adjustment of the conditions allowed the selective formation and isolation of salts of all anions of the series [Et Pb{B(CN) } ] (n=2-4) including the homoleptic tetraanion [Pb{B(CN) } ] .
Download full-text PDF |
Source |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9322310 | PMC |
http://dx.doi.org/10.1002/anie.202202882 | DOI Listing |
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