Some recent developments in direct methods for solving crystal structures

Schenk, H.

doi:10.1002/recl.19831020101

Cited by 2 publications

(1 citation statement)

References 52 publications

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“…Solutions to this problem have been developed considering the physical and statistical aspects of two-beam Bragg re¯ections. These include direct methods (see, for example, Schenk, 1991, and references therein), methods involving isomorphous and molecular replacements (Rossmann, 1972), anomalous dispersion (Hendrickson, 1991), entropy maximization (Bricogne & Gilmore, 1990) and many others (Woolfson & Fan, 1995, and references therein).…”

Section: Introductionmentioning

confidence: 99%

Determination of X-ray Reflection Phases Using N-Beam Diffraction

Chang¹

1998

Acta Cryst Sect A

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The relationship between X-ray re¯ection phase and N-beam diffraction as well as the phase-determination method utilizing N-beam interference effects are described. The experimental techniques of producing N-beam diffraction and the theoretical grounds, both kinematical and dynamical, of the phase-determination method are presented and discussed. Experimental phase determination using N-beam diffraction for single crystals of small molecules and macromolecules is demonstrated. Prospective future development of this particular phasing method is also given.

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Section: Introductionmentioning

confidence: 99%

Determination of X-ray Reflection Phases Using N-Beam Diffraction

Chang¹

1998

Acta Cryst Sect A

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The unexpected formation of trans‐β‐lactams in the reaction of α‐iminoesters (RNC(H)C(O)OR′) with diethylzinc. Crystal structure of trans‐1‐(N‐t‐butyl)‐3‐(N‐t‐butyl‐N‐ethylamino)‐4‐ methoxycarbonylazetidin‐2‐one

Vliet¹,

Klaver²,

Jastrzebski

et al. 1987

Recl. Trav. Chim. Pays‐Bas

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Reaction of iminoesters, R-N=C(H)COOR', (R = 1-Bu, i-Pr ; R' = Me, Et ) with diethylzinc affords in a selective quantitative reaction trans-p-lactams. An X-ray crystal structure determination of the obtained trans-1 -(N-1-bu ty 1)-3 -(N-L-bu ty 1 -N-e thy la mi no) -4 -met hox y --carbonylazetidin-2-one has been carried out. The formation of the trans-p-lactams is believed to proceed via zinc enolates. in the reaction of a -i m i n o e s t e r s -3-(N-1-butyl-N-et hylamino)-4-methoxycarbonylazetidin-2-one

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Some recent developments in direct methods for solving crystal structures

Cited by 2 publications

References 52 publications

Determination of X-ray Reflection Phases Using N-Beam Diffraction

Determination of X-ray Reflection Phases Using N-Beam Diffraction

The unexpected formation of trans‐β‐lactams in the reaction of α‐iminoesters (RNC(H)C(O)OR′) with diethylzinc. Crystal structure of trans‐1‐(N‐t‐butyl)‐3‐(N‐t‐butyl‐N‐ethylamino)‐4‐ methoxycarbonylazetidin‐2‐one

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