The homonuclear doublequantum correlation experiment INADEQUATE (I7) represents an important capability for structure determination using NMR. In this experiment, spin-spin (scalar) coupling is used to generate double-quantum coherence between pairs of magnetic nuclei. In the two-dimensional version of this experiment, the double-quantum frequencies are allowed to evolve for a time t, . Then, after an appropriate readout pulse, magnetization is detected during time tz. In the two-dimensional spectrum, coupled nuclei with chemical-shift offsets of 6, and 8* in the F2 dimension are observed in F, at a frequency of 6, + 6z, thus allowing connectivities to be established. Well used and documented in the area of liquid-state NMR, the technique has not yet been applied to problems using cross polarization/magic-angle spinning (CP/MAS) NMR because of the difficulties associated with the observation of scalar coupling in CP/MAS NMR. In usual CP/MAS NMR samples, dipolar coupling usually obscures any scalar coupling which might be present. There are, however, a number of CP/MAS samples where scalar homonuclear couplings can be observed. Plastic crystals are an example of a type of sample which cross polarizes and can still show homonuclear scalar coupling. This note illustrates scalar double-quantum observation using two different plastic crystalline samples. Dipolar double-quantum spectra have been observed using cross polarization with an isotopically enriched single crystal of glycine (8). Although the pulse experiment used in the single crystalline glycine study is very similar to the sequence described in this work, there is a major difference in the experimental details. In the dipolar case, T delays necessary to generate doublequantum coherence are relatively short due to the strong dipolar interaction strength, while in the case of scalar couplings, 7 delay times are relatively long due to the weak interaction of the scalar coupling. The results reported in this paper are more closely related to the liquid-phase INADEQUATE experiment than to the glycine study referenced above. The solids INADEQUATE pulse sequence, illustrated in Fig. 1, was based on a liquid-state experiment which uses a 45” read pulse (6) and requires 128 scans for a complete phase cycle. For the solids experiment, the initial 90” pulse was replaced by a proton decoupler 90” pulse and a Hartmann-Hahn cross-polarization pulse (CP). Spin temperature alternation was also incorporated into the phase cycling to eliminate artifacts. After 128 scans are acquired to complete the phase cycle, the phase of the