Magnesium’s divalent nature and likely importance as a building block for planet formation lends it credence to being a reasonable replacement for oxygen in organometallic species found in the interstellar medium (ISM). With the natural abundance of acetylene and magnesium and the presence of propylene oxide in the ISM, a natural next-step for astrochemical exploration of such organometallic molecules would be magnesacyclopropene (c-MgC2H2). The present work utilizes a combination of highly accurate quantum chemical quartic force field approaches to provide fundamental anharmonic frequencies to assist in the observation of the 11A1 and 13B2 electronic states of c-MgC2H2 and potential energy surface (PES) scans of Mg dissociation to assist in possible formation pathways of this molecule. The 13B2ω7 mode is less than 0.5 cm−1 above previous theory implying that the current work is accurate and reliable. The 13B2 electronic state is lower in energy than the 11A1 by approximately 10.3 kcal/mol, while the 11A1 electronic state is more rovibrationally observable with three fundamental vibrational frequencies having intensities of greater than 100 km/mol and a dipole moment of 5.47 D. The PES scan of the Mg dissociation shows a flatter well for the 13B2, rather than the 11A1, electronic state offering overlap between the vibronic levels. While radiative association is likely required for formation of c-MgC2H2, the triplet surface is rather flat reducing the energy gaps between vibrational levels. Additionally, the singlet surface in many ways mirrors the triplet providing for both likely and low-energy transitions between the states.