Non-factorizable contributions to Bd0¯→Ds(*)Ds(*)¯

It is pointed out that decays of the type B→DD¯ have no factorizable contributions, unless at least one of the charmed mesons in the final state is a vector meson. The dominant contributions to the decay amplitudes arise from chiral loop contributions and tree level amplitudes generated by soft gluon emissions forming a gluon condensate. We predict that the branching ratios for the processes B¯0→Ds+Ds−, B¯0→Ds+*Ds− and B¯0→Ds+Ds−* are all of order (3−4)×10−4, while B¯0→Ds+*Ds−* has a branching ratio 5 to 10 times bigger. We emphasize that the branching ratios are sensitive to 1/mc corrections.