Newman, Sawhorse & Fischer Projections Simulation

Newman, Sawhorse and Fischer projections are three ways of drawing the same three-dimensional molecule on paper. A Newman projection looks straight down a C–C bond: the front carbon's bonds meet at the centre and the back carbon is a circle. A Sawhorse projection shows the same bond at an angle, front carbon lower-left. A Fischer projection puts the carbon chain vertical with every vertical bond going away from you and every horizontal bond coming towards you; it always shows the eclipsed conformation.

This Newman, Sawhorse and Fischer projection simulation draws all three from one 3D model, so they can never disagree, and converts any projection into any other step by step: the camera moves, the back carbon turns to the eclipsed form when a Fischer projection is the target, and the drawing flattens into the cross. The R/S labels of both stereocentres stay on screen and never change, because turning a single bond or changing the drawing does not change the molecule. A “common mistake” view shows what happens if you copy left and right straight from a staggered Newman: the wrong stereoisomer.