Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Chemical Properties of Dialkyl Halonium Ions (R2Hal+) and Their Neutral Analogues, Methyl Carboranes, CH3-(CHB11Hal11), Where Hal = F, Cl. / Stoyanov, Evgenii S.
в: Journal of Physical Chemistry A, Том 121, № 15, 20.04.2017, стр. 2918-2923.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Chemical Properties of Dialkyl Halonium Ions (R2Hal+) and Their Neutral Analogues, Methyl Carboranes, CH3-(CHB11Hal11), Where Hal = F, Cl
AU - Stoyanov, Evgenii S.
PY - 2017/4/20
Y1 - 2017/4/20
N2 - Chloronium cations in their salts (CnH2n+1)2Cl+{CHB11Cl11 -}, with n = 1 to 3 and exceptionally stable carborane anions, are stable at ambient and elevated temperatures. The temperature at which they decompose to carbocations with HCl elimination (below 150 °C) decreases with the increasing n from 1 to 3 because of increasing ionicity of C-Cl bonds in the C-Cl+-C bridge. At room temperature, the salts of cations with n ≥ 4 [starting from t-Bu2Cl+ or (cyclo-C5H11)2Cl+] are unstable and decompose. With decreasing chloronium ion stability, their ability to interact with chloroalkanes to form oligomeric cations increases. It was shown indirectly that unstable salt of fluoronium ions (CH3)2F+(CHB11F11 -) must exist at low temperatures. The proposed (CH3)2F+ cation is much more reactive than the corresponding chloronium, showing at room temperature chemical properties expected of (CH3)2Cl+ at elevated temperatures.
AB - Chloronium cations in their salts (CnH2n+1)2Cl+{CHB11Cl11 -}, with n = 1 to 3 and exceptionally stable carborane anions, are stable at ambient and elevated temperatures. The temperature at which they decompose to carbocations with HCl elimination (below 150 °C) decreases with the increasing n from 1 to 3 because of increasing ionicity of C-Cl bonds in the C-Cl+-C bridge. At room temperature, the salts of cations with n ≥ 4 [starting from t-Bu2Cl+ or (cyclo-C5H11)2Cl+] are unstable and decompose. With decreasing chloronium ion stability, their ability to interact with chloroalkanes to form oligomeric cations increases. It was shown indirectly that unstable salt of fluoronium ions (CH3)2F+(CHB11F11 -) must exist at low temperatures. The proposed (CH3)2F+ cation is much more reactive than the corresponding chloronium, showing at room temperature chemical properties expected of (CH3)2Cl+ at elevated temperatures.
KW - FLUORONIUM ION
KW - HYPERCONJUGATION
KW - CARBOCATIONS
KW - TEMPERATURE
KW - PROTONATION
KW - ENERGETICS
KW - EXCHANGE
KW - CATIONS
KW - ACIDITY
KW - HALIDES
UR - http://www.scopus.com/inward/record.url?scp=85020030045&partnerID=8YFLogxK
U2 - 10.1021/acs.jpca.7b01203
DO - 10.1021/acs.jpca.7b01203
M3 - Article
C2 - 28355067
AN - SCOPUS:85020030045
VL - 121
SP - 2918
EP - 2923
JO - Journal of Physical Chemistry A
JF - Journal of Physical Chemistry A
SN - 1089-5639
IS - 15
ER -
ID: 10189057