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Volumn 36, Issue 998, 1998, Pages

Analysis of substituent effects on 31P NMR chemical shifts: PX2Y molecules

Author keywords

31P chemical shifts; 31P NMR; Electronegativity; GIAO 6 311 + G**; MP2 geometries; Negative hyperconjugation; NMR; Tricoordinate phosphorus

Indexed keywords

CHEMICAL BONDS; CHEMICAL SHIFT; ELECTRONEGATIVITY; MOLECULES;

EID: 0032360591     PISSN: 07491581     EISSN: None     Source Type: Journal    
DOI: 10.1002/(sici)1097-458x(199806)36:133.0.co;2-t     Document Type: Article
Times cited : (15)

References (82)
  • 8
    • 85161739192 scopus 로고    scopus 로고
    • note
    • 3F] can be reduced to deviations of 40, 0, -30 and -20 ppm, respectively, by using a 40 ppm C - F increment.
  • 9
    • 85161770780 scopus 로고    scopus 로고
    • note
    • 31P) increments from Refs 1 and 21 compared with 72 experimental values give an rmse of 69 ppm; the largest deviations are 25 and -217 ppm for shift values between -240 and 244 ppm.
  • 15
    • 85161779814 scopus 로고
    • Dissertation, Erlangen-Nürnberg
    • A. R. v. Onciul, Dissertation, Erlangen-Nürnberg (1994).
    • (1994)
    • Onciul, A.R.V.1
  • 17
    • 85161740480 scopus 로고    scopus 로고
    • A 'descriptor' is a statistical term for factors which could be employed to estimate a property of interest
    • A 'descriptor' is a statistical term for factors which could be employed to estimate a property of interest.
  • 20
    • 85161789052 scopus 로고    scopus 로고
    • 19 is that of the atom bonded to phosphorus
    • 19 is that of the atom bonded to phosphorus.
  • 24
    • 85161740359 scopus 로고    scopus 로고
    • note
    • γ = number of α-, β-and γ-substituents, largest error below 5 ppm; Ref. 3).
  • 28
    • 85161736819 scopus 로고    scopus 로고
    • 68 give 105.66 ppm
    • 68 give 105.66 ppm.
  • 30
    • 85161771162 scopus 로고    scopus 로고
    • GIAO/6-311 + G**//RMP2(fc)/6-31 + G* values from Table 3, Fig. 4.
    • GIAO/6-311 + G**//RMP2(fc)/6-31 + G* values from Table 3, Fig. 4.
  • 37
    • 85161793078 scopus 로고    scopus 로고
    • note
    • The complete list of molecules considered and details of the statistical evaluation are provided in the supplementary material: (a) table of the experimental chemical shifts used to examine increment performance;
  • 38
    • 85161769362 scopus 로고    scopus 로고
    • note
    • (b) geometries of PXYZ phosphanes 65-120.
  • 45
    • 85161752608 scopus 로고    scopus 로고
    • note
    • 3 (n = 1, 240.8; n = 2, 240.6; n = 3, 238.7).
  • 46
    • 85161734245 scopus 로고    scopus 로고
    • note
    • 3) [GIAO/6-311 + G**//MP2(fc)/6-31 + G**] = 592.9 (see Table 3).
  • 51
    • 85161733600 scopus 로고    scopus 로고
    • note
    • 49
  • 53
    • 0004250173 scopus 로고
    • Academic Press, London
    • Ref. 43 and references cited therein. For semiempirical approximations, see I. Ando and G. A. Webb, Theory of NMR Parameters. Academic Press, London (1983).
    • (1983) Theory of NMR Parameters
    • Ando, I.1    Webb, G.A.2
  • 54
    • 85161762220 scopus 로고    scopus 로고
    • note
    • 0.
  • 55
    • 85161793553 scopus 로고    scopus 로고
    • note
    • P1' (Ref. 11). In some approaches terms such as 'the contribution from the magnetic anisotropy of neighboring groups' and from 'the ring current effects in arenes' occur (see Ref. 7, p. 40).
  • 62
    • 85161767301 scopus 로고    scopus 로고
    • note
    • 2Y with 'simple substituents' (Table 3) is 122 ppm.
  • 65
    • 85161747384 scopus 로고    scopus 로고
    • note
    • 2(BH2)]
  • 82
    • 85161786790 scopus 로고    scopus 로고
    • note
    • 31P) with experimental data of related phosphanes is likely to deviate (due more to the neglected effects than to insufficiency of the theoretical treatment).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.