Letter | Published:

Crystal Structures of Two Para-substituted Phenylpropionic Acids

Naturevolume 169page1008 (1952) | Download Citation



β-PHENYLPROPIONIC acid is of particular interest as an inhibitor in the carboxypeptidase system1, in addition to its general interest in biology. One of us2 has shown that the unsubstituted acid is not amenable to X-ray analysis, having eight molecules in a monoclinic primitive cell. We have therefore studied the para-substituted chlorine and bromine compounds. They are isomorphous, with cell data as follows: in each case with four molecules per unit cell. Weissenberg multiple-film techniques were used in visual evaluation of the reflexion intensities, and the precession camera was used in determining the cell dimensions and in checking the orientation adopted. The [010] projections are well resolved for both these substances and are quite similar. That for the chlorine compound is illustrated in the accompanying diagram. The [001] projections are less well resolved.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1

    For example, see Smith, Emil L., and Lumry, R., Cold Spring Harbor Symp. Quant. Biol., 14, 168 (1950).

  2. 2

    Patterson, A. L., Phil. Mag., 3, 1252 (1927).

Download references

Author information


  1. Institute for Cancer Research and Lankenau Hospital Research Institute, Philadelphia, 11, Pennsylvania

    •  & JOAN R. CLARK


  1. Search for A. L. PATTERSON in:

  2. Search for JOAN R. CLARK in:

About this article

Publication history

Issue Date




By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.