(a) An  agreement  for the purchase by a corporation of its own shares
shall be enforceable by the  shareholder  and  the  corporation  to  the
extent such purchase is permitted at the time of purchase by section 513
(Purchase or redemption by a corporation of its own shares).
  (b) The possibility that a corporation may not be able to purchase its
shares  under  section  513  shall not be a ground for denying to either
party specific performance  of  an  agreement  for  the  purchase  by  a
corporation  of  its  own  shares,  if  at  the time for performance the
corporation can purchase all or part of such shares under section 513.
Structure New York Laws
502 - Issue of Any Class of Preferred Shares in Series.
503 - Subscription for Shares; Time of Payment, Forfeiture for Default.
504 - Consideration and Payment for Shares.
506 - Determination of Stated Capital.
507 - Compensation for Formation, Reorganization and Financing.
508 - Certificates Representing Shares.
509 - Fractions of a Share or Scrip Authorized.
510 - Dividends or Other Distributions in Cash or Property.
511 - Share Distributions and Changes.
514 - Agreements for Purchase by a Corporation of Its Own Shares.
516 - Reduction of Stated Capital in Certain Cases.
519 - Convertible or Exchangeable Shares and Bonds.
520 - Liability for Failure to Disclose Required Information.